Questions You Should Know about 0.5 Ton Gas Steam Generator

A Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________. steam and water are separated in the accumulator (flash chamber) the heat of combustion is sufficient to remove all moisture from the steam the volume of steam is small at low pressures automatic burner cycling controls steam volume and quality A In a coil-type forced circulation auxiliary water-tube boiler,__________. steam demand response is comparatively rapid steam is recirculated through heating coils in the boiler unevaporated feed water is discharged through the skim tube steam demand response is slow C The gage glass on a coil-type auxiliary boiler is connected to the __________. heating coil inlet and outlet surge chamber accumulator water softener A Which of the following statements concerning fire-tube boilers is correct? Combustion gases flow through the tubes. Flames impinge on the tubes. Combustion occurs in the tubes. Water flows through the tubes. D Bottom blow valves are installed on auxiliary water-tube boilers to __________. completely drain the boiler in an emergency prevent sludge from forming in the steam drum remove floating impurities from the boiler water surface remove settled solids from the water drum B Auxiliary boilers are divided into several classifications, one of which is __________. water-tube supercritical circulation water-tube forced circulation fire-tube controlled circulation fire-tube express circulation B The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. operating the boiler at less than normal water level installing fins on the firesides of water-tubes increasing the amount of excess air to the burners treating the boiler water with chemical oxygen scavengers A Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by __________. refractory and insulation several rows of screen tubes steel baffles water wall tubes A The purpose of try-cocks used on an auxiliary boiler is to __________. provide an alternate means of determining the water level, if the gage glass fails provide a means of adding chemical feed to the boiler water provide a means for blowing down the gage glass act as a steam sentinel valve, if any of the fusible plugs should melt A The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate __________. dry steam from the steam and water mixture condensate from feed water superheated steam from saturated steam sludge accumulations from feed water B The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. operating the boiler at less than normal water level installing fins on the firesides of water-tubes increasing the amount of excess air to the burners treating the boiler water with chemical oxygen scavengers B The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________. girder stays fire-tubes and stay-tubes external boiler plating separate crown sheets A Which of the following statements concerning fire-tube boilers is correct? Combustion gases flow through the tubes. Flames impinge on the tubes. Combustion occurs in the tubes. Water flows through the tubes. D The boiler shown in the illustration would be classed as __________. Illustration MO- forced circulation, coil-type two-pass, scotch marine two-pass, water-tube single-pass, fire-tube, scotch marine A Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet? The fusible plugs will melt. The furnace will explode. Excess steam will be generated. The furnace will overheat. B Fusible plugs are installed in fire-tube boilers to __________. provide a means of draining the boiler warn the engineer of low water level cool the crown sheet at high firing rates open the burners' electrical firing circuits D Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________. automatically supplied with warmer air on demand automatically supplied with more fuel on demand equipped with standard variable capacity atomizers cycled on and off in response to steam demand C The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________. accidental dry firing and overpressure uncontrolled fires in the furnace explosions in the boiler furnace overheating of the pressure parts A A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________. opens the burner circuit upon sensing a flame failure detects a flame failure by monitoring radiant heat from glowing refractory requires mechanical linkage to secure the burner fuel supply must be bypassed at low firing rates A During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as __________. limit controls flame safeguard controls combustion controls programming controls B Which of the listed sequence of events occurs when an automatic auxiliary boiler is prepurged? The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the closed position. The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position. The damper is moved to the closed position for a given number of seconds and then moved to the low fire position. The damper in the uptakes is moved to the wide open position for a given number of seconds and then moved to the low firing rate position. D The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________. controls the flow of feed water to the boiler monitors the boiler high water level secures the fires when a fusible plug burns out automatically regulates the quantity of oil and air flow to the burner B Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained? A temperature sensing device opens the circuit breaker in the burner motor. The high limit control secures power to the entire oil firing system. The stack relay actuates the low limit control which breaks the ignition circuit. The stack relay secures power to the high voltage side of the ignition transformer. C Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in an auxiliary boiler return flow fuel oil system? Through the outer barrel tube. Through the sprayer plate drilled passages. Through tangential slots in the sprayer plate. Through baffles in the orifice plate. C The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by __________. a decrease in feed temperature high furnace air pressure high steam pressure low steam pressure B A variable capacity, pressure atomizing, fuel oil burner functions to __________. maintain a constant fuel temperature provide a wide range of combustion provide a constant fuel return pressure maintain smokeless fuel oil atomization A When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will __________. increase the fuel oil control valve opening increase the rotary cup speed decrease the back pressure regulating valve opening decrease the supply steam control valve opening B Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a __________. pressure magnifying device in the steam coil outlet steam pressure sensing device with linkage to the damper air vanes metering device in the air supply line signal from the feed water electrode C Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off? To examine the valve stem for scars or nicks. To check for a tight bonnet seal. To ensure that the valve will not be seized shut when hot. To check the valve packing. C When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil __________. directly to the fuel oil heater inlet for further warm-up back to the fuel oil settler for further filtration back to the suction side of the service pump directly to the deep tanks B Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler? Automatic bottom blow valve Low water level cutoff switch Voltage output of the ignition transformer Insulation resistance readings in the ignition system high tension leads A Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________. steam and water are separated in the accumulator (flash chamber) the heat of combustion is sufficient to remove all moisture from the steam the volume of steam is small at low pressures automatic burner cycling controls steam volume and quality C The gage glass on a coil-type auxiliary boiler is connected to the __________. heating coil inlet and outlet surge chamber accumulator water softener D Bottom blow valves are installed on auxiliary water-tube boilers to __________. completely drain the boiler in an emergency prevent sludge from forming in the steam drum remove floating impurities from the boiler water surface remove settled solids from the water drum B The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. operating the boiler at less than normal water level installing fins on the firesides of water-tubes increasing the amount of excess air to the burners treating the boiler water with chemical oxygen scavengers A The purpose of try-cocks used on an auxiliary boiler is to __________. provide an alternate means of determining the water level, if the gage glass fails provide a means of adding chemical feed to the boiler water provide a means for blowing down the gage glass act as a steam sentinel valve, if any of the fusible plugs should melt B The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. operating the boiler at less than normal water level installing fins on the firesides of water-tubes increasing the amount of excess air to the burners treating the boiler water with chemical oxygen scavengers B The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________. girder stays fire-tubes and stay-tubes external boiler plating separate crown sheets A Which of the following statements concerning fire-tube boilers is correct? Combustion gases flow through the tubes. Flames impinge on the tubes. Combustion occurs in the tubes. Water flows through the tubes. C The boiler shown in the illustration would be classed as __________. Illustration MO- two-pass, water-tube two-pass, scotch marine single-pass, fire-tube, scotch marine forced circulation, coil-type A Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet? The fusible plugs will melt. The furnace will explode. Excess steam will be generated. The furnace will overheat. B Fusible plugs are installed in fire-tube boilers to __________. provide a means of draining the boiler warn the engineer of low water level cool the crown sheet at high firing rates open the burners' electrical firing circuits D Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________. automatically supplied with warmer air on demand automatically supplied with more fuel on demand equipped with standard variable capacity atomizers cycled on and off in response to steam demand C The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________. accidental dry firing and overpressure uncontrolled fires in the furnace explosions in the boiler furnace overheating of the pressure parts A A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________. opens the burner circuit upon sensing a flame failure detects a flame failure by monitoring radiant heat from glowing refractory requires mechanical linkage to secure the burner fuel supply must be bypassed at low firing rates A During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as __________. limit controls flame safeguard controls combustion controls programming controls B Which of the listed sequence of events occurs when an automatic auxiliary boiler is prepurged? The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the closed position. The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position. The damper is moved to the closed position for a given number of seconds and then moved to the low fire position. The damper in the uptakes is moved to the wide open position for a given number of seconds and then moved to the low firing rate position. D The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________. controls the flow of feed water to the boiler monitors the boiler high water level secures the fires when a fusible plug burns out automatically regulates the quantity of oil and air flow to the burner B Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained? A temperature sensing device opens the circuit breaker in the burner motor. The high limit control secures power to the entire oil firing system. The stack relay actuates the low limit control which breaks the ignition circuit. The stack relay secures power to the high voltage side of the ignition transformer. C Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in a auxiliary boiler return flow fuel oil system? Through the outer barrel tube. Through the sprayer plate drilled passages. Through tangential slots in the sprayer plate. Through baffles in the orifice plate. C The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by __________. a decrease in feed temperature high furnace air pressure high steam pressure low steam pressure B A variable capacity, pressure atomizing, fuel oil burner functions to __________. maintain a constant fuel temperature provide a wide range of combustion provide a constant fuel return pressure maintain smokeless fuel oil atomization A When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will __________. increase the fuel oil control valve opening increase the rotary cup speed decrease the back pressure regulating valve opening decrease the supply steam control valve opening B Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a __________. pressure magnifying device in the steam coil outlet steam pressure sensing device with linkage to the damper air vanes metering device in the air supply line signal from the feed water electrode C Treatment of boiler feedwater for the control of hardness is necessary to prevent __________. excessive feed water alkalinity foaming waterside scale deposits carryover B A unit of measure used to express the chloride content of boiler water is __________. pH PPM Micro-Farads Micro-Ohms B Which of the listed methods can be used to blow down a boiler without securing the fires? Bottom blow from the mud drum. Steam drum surface blow. Blow down the front water wall header. Blow down the rear water wall header. A Dissolved oxygen can be removed from the boiler water by __________. treating the water with chemical scavengers dumping and refilling the boiler weekly passing the water through absorbent filters frequent surface and bottom blows A Eight (ounces of oxygen, dissolved in 500,000 pounds of water, is a concentration of __________. 1.0 ppm 4.0 ppm 8.0 ppm 16.0 ppm C Proper use of the boiler surface blow will __________. have no effect on boiler alkalinity remove most precipitated solids remove floating impurities from boiler water disrupt circulation in a steaming boiler D Chemicals are added to boiler water to __________. stabilize feed water if a boiler becomes salted up eliminate the need for blow downs maintain an acidic condition in the feed water prevent scale forming deposits A Before giving a boiler a bottom blow, it should be taken off the line and then the __________. water level initially raised above normal water level initially lowered below normal boiler air cock should be cracked boiler steam pressure should be increased A As the pH of the boiler water approaches zero, the water becomes increasingly __________. acidic neutral alkaline soft A Normally a boiler water sample should be taken __________. before the boiler has been blown down or chemicals added from the highest point in the feed system when the boiler has been refilled with makeup after the boiler has been blown down B A boiler water sample being collected for analysis should be circulated through a cooling coil because __________. the cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify this keeps the water from flashing into steam as it is drawn from the higher pressure of the boiler into atmospheric conditions it reduces the amount of suspended matter that frequently finds its way into the dead end lines the degree of acidity as measured on the pH recorder is amplified by cool water temperatures C A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feed water quality is 0.5 ppm, the concentration of solids will increase 1.5 ppm every hour. What would be the increase in the concentration of solids within 24 hours? 12 ppm 24 ppm 36 ppm 48 ppm D Testing boiler water for chloride content will indicate the amount of __________. phosphates present in the water total alkalinity in the water methyl orange that should be added dissolved salts from sea contamination D The amount of sodium phosphate in treated boiler water can be measured by a/an __________. alkalinity test chloride test sodium phosphorous test phosphate test B A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the __________. sample color changes from clear to pink sample color changes from pink to clear entire concentration of chlorides have been neutralized water sample pH reaches 10.5 C What boiler water chemistry is necessary to ensure the precipitation of hard scale forming calcium? Boiler water should be slightly acidic. Boiler water hardness should be high. Boiler water should have a reserve of phosphates. Hydrazine concentrations should be at the proper level. C Phenolphthalein is used as an indicator to test boiler water for __________. hardness chloride content alkalinity hydrazine A A dissolved oxygen concentration of 8.0 ppm represents __________. 8 ounces of oxygen dissolved in 1,000,000 ounces of water 8 lbs of oxygen dissolved in 1,000,000 tons of water 8 tons of oxygen dissolved in 1,000,000 pounds of water 80 ounces of oxygen dissolved in 100,000 ounces of water A A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should __________. completely fill the boiler with deaerated feed water and maintain a slight pressure drain and refill the boiler when the pH goes above 6 drain and refill the boiler each week completely fill the boiler with water, then blow down to steaming level C The major reason dissolved gases are removed from boiler feedwater is because they may cause __________. condenser vacuum loss vapor lock in the feed pumps corrosive conditions in the boiler a false boiler water level D Ferrous sulfate tends to go into solution in boiler water when the value of the hydrogen ion concentration increases. Consequently, the water in a 900 psi boiler should be __________. pure with zero pH value pure and treated to a pH value of 4.0 to 4.5 maintained at a pH value of 7.0 pure and treated to a pH value of 10.5 to 11.0 C Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals? Sodium hydroxide Caustic soda Sodium phosphate Phenolphthalein C In the prevention of moisture carryover from a marine boiler, one important consideration is to __________. add foaming agents to the boiler water properly treat the boiler water with hydrazine control the amount of boiler water solids maintain a high boiler water level A Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by __________. maintaining a normal level of scavenging agents maintaining low boiler water pH testing frequently for total dissolved solids giving the boiler frequent surface blows D An adequate phosphate reserve should be maintained in boiler water to __________. remove dissolved oxygen concentrations reduce the blow down frequency maintain a pH of 7 prevent hard scale formation A When a boiler water test indicates a pH value of 6, you should __________. chemically treat to raise the pH to normal level begin a continuous boiler blow down check the DC heater for possible malfunction chemically treat to lower the pH to normal level D Scale prevention in boiler water is accomplished by adding treatment chemicals to __________. cause the water to be neutral increase boiler water acidity solidify the scale as powder precipitate scale forming salts into sludge B To minimize metal corrosion, boiler water is best kept __________. fairly acidic alkaline slightly acidic neutral D If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the __________. feed water crossover line superheater tubes economizer tubes internal desuperheater flange D Boiler water hardness is increased by_______. zero alkalinity in the water improper operation of the DC heater dissolved gases in the water scale forming salts in the feed water A Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas __________. forms carbonic acid which attacks the watersides combines with sulfates to cause severe waterside pitting breaks the magnetic iron oxide film inside boiler tubes combines with oxygen to cause severe waterside scaling C A leak in a desuperheater could be indicated by an __________. increased boiler water compound level in the boiler with the affected desuperheater increased concentration of dissolved oxygen in boiler water inability to maintain proper boiler water pH or phosphate levels inability to maintain control of boiler water suspended solids A Excessive alkalinity of boiler water will cause __________. caustic embrittlement scale formation sodium sulfite reacting with dissolved oxygen calcium carbonate precipitation A The concentration of total dissolved solids in the boiler water can increase as a result of __________. insufficient blow down zero water hardness frequent surface blows dissolved oxygen deaeration B Excessive carbon dioxide formed by improper chemical treatment in the boiler may cause corrosion in the __________. boiler generating tubes condensate lines boiler superheater tubes main and auxiliary steam lines A A malfunction in the DC heater is indicated by __________. the boiler requiring excessive amounts of oxygen scavenging chemicals condensate coming in contact with steam inside the heater water and steam entering the DC heater at different temperatures air flowing from the DC heater vent connection pipe B A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feed water quality is 0.5 ppm, the concentration of solids will increase 1.5 ppm every hour. What would be the increase in the concentration of solids within 24 hours? 48 ppm 36 ppm 24 ppm 12 ppm C Testing boiler water for chloride content will indicate the amount of __________. total alkalinity in the water methyl orange that should be added dissolved salts from sea contamination phosphates present in the water A A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the __________. sample color changes from pink to clear water sample pH reaches 10.5 entire concentration of chlorides have been neutralized sample color changes from clear to pink C Phenolphthalein is used as an indicator to test boiler water for __________. chloride content hardness alkalinity hydrazine C A dissolved oxygen concentration of 8.0 ppm represents __________. 8 tons of oxygen dissolved in 1,000,000 pounds of water 8 lbs of oxygen dissolved in 1,000,000 tons of water 8 ounces of oxygen dissolved in 1,000,000 ounces of water 80 ounces of oxygen dissolved in 100,000 ounces of water D Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals? Phenolphthalein Caustic soda Sodium hydroxide Sodium phosphate A Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by __________. maintaining a normal level of scavenging agents maintaining low boiler water pH testing frequently for total dissolved solids giving the boiler frequent surface blows A When a boiler water test indicates a pH value of 6, you should __________. chemically treat to raise the pH to normal level check the DC heater for possible malfunction begin a continuous boiler blow down chemically treat to lower the pH to normal level D To minimize metal corrosion, boiler water is best kept __________. slightly acidic neutral fairly acidic alkaline D If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the __________. superheater tubes economizer tubes feed water crossover line internal desuperheater flange B Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas __________. combines with oxygen to cause severe waterside scaling forms carbonic acid which attacks the watersides combines with sulfates to cause severe waterside pitting breaks the magnetic iron oxide film inside boiler tubes A Excessive alkalinity of boiler water will cause __________. caustic embrittlement sodium sulfite reacting with dissolved oxygen calcium carbonate precipitation scale formation C Excessive carbon dioxide formed by improper chemical treatment in the boiler may cause corrosion in the __________. boiler superheater tubes boiler generating tubes condensate lines main and auxiliary steam lines C A malfunction in the DC heater is indicated by __________. condensate coming in contact with steam inside the heater air flowing from vent condenser vent the boiler requiring excessive amounts of oxygen scavenging chemicals water and steam entering the DC heater at different temperatures A Air accumulated in the inter condenser of the air ejector assembly is discharged directly to the __________. after condenser high-pressure turbine main condenser atmosphere B Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank? Fresh water cooler Recirculating line to the main condenser Salt water cooler Recirculating line to the main feed pump C The loop seal connected to the main condenser returns the drains from the __________. after condenser vent condenser inter condenser All of the above. C Main condensate recirculating systems are primarily intended to __________. balance and control condensate temperatures at full load prevent excessive overheating of the condensate pumps provide adequate cooling water for the air ejector condensers vent accumulated vapors from the condensate pump discharge D Which statement is true concerning two-stage air ejector assemblies? The first stage air ejector takes suction on the second stage to increase vacuum. Steam to the after condenser is condensed and returned to the main condenser via the loop seal. Air is removed from the condensate as it passes through the tubes. The steam/air mixture from the main condenser is discharged by the first stage air ejector to the inter condenser. B While vacuum is being raised on the main unit and the turbine is being warmed, condensate is recirculated to the main condenser to __________. cool the main condenser shell for better vacuum ensure the condensation of air ejector steam maintain a proper DC heater water level provide a condenser vacuum seal A The automatic recirculating valve in the main condensate recirculating line is controlled by a temperature sensor which is located at the __________. air ejector condensate discharge condensate inlet to the main air ejectors main condensate pump suction main condensate pump discharge C A salinity indicator cell is located in the __________. low-pressure turbine casing drain evaporator brine suction line main condenser hotwell sea water side of the main condenser C Serious tube leaks in the air ejector condenser assembly will cause __________. fouled nozzles faulty steam pressure loss of vacuum clogged steam strainers D Why does air entry into the main condenser reduce the efficiency of the steam cycle? Steam flow rate through the main turbine increases Condensate sub cooling in the main condenser increases The air mixes with the steam and enters the condensate Low-pressure turbine exhaust steam enthalpy value increases B Which statement listed represents a vital function of the main condenser? Cooling of the exhaust steam from the auxiliary exhaust system before it enters the deaerating feed tank. The recovery of feed water for reuse. Storage of feed water for immediate use in the boilers. Condensing of the exhaust steam from the main feed turbine pumps. B Which of the following actions should be taken to re-establish a 'blown' air ejector loop seal? Decrease the steam pressure to the air ejector nozzles. Momentarily close the valve in the loop seal line, and then reopen slowly. Shut off the steam to the second stage air ejector momentarily then open it again. Increase the condensate flow through the air ejector. A When condenser tube ends are rolled into both tube sheets, the different rates of material expansion are compensated for by utilizing. expansion joints in the condenser shell metallic packing pressed around the tube ends threaded brass ferrules on the tube ends belled joints at both tube ends A While underway, vacuum in the main condenser is primarily caused by the __________. condensing of the exhausting steam after condenser loop seal main air ejector suction drawn by the condensate pump B The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________. the vacuum in the pump suction a water seal line to the packing gland special packing in the stuffing box an air seal line from the compressed air line D In a marine condenser designed with a reheating hot well, the hot well is reheated by __________. recirculation of condensate submerged heating coils supplied with auxiliary exhaust steam a branch line from the air ejector steam supply steam lanes in the condenser C A main condenser utilizing a scoop for the circulation of sea water must be constructed as a __________. two-pass heat exchanger counter flow heat exchanger single-pass heat exchanger parallel flow heat exchanger C If the main condenser were operating at a vacuum of 28.5" Hg, a condensate discharge temperature of 86°F, a sea water inlet temperature of 72°F, and a sea water outlet temperature of 79°F, what would be the condensate depression? Illustration SG- 0.2 inches Hg 0.7 inches Hg 4 degrees Fahrenheit 7 degrees Fahrenheit B The differential temperature of the main condenser cooling water will be significantly affected by a change in __________. condensate pump pressure volume of cooling water flow boiler feed pump pressure sea temperature C Air accumulated in the after condenser of the air ejector unit is discharged directly to the __________. main condenser inter condenser atmosphere high-pressure turbine D Under normal conditions, the rate of heat transfer in a feedwater heater is most greatly affected by the __________. speed of the main feed pump density of the feed water pH of the feed water temperature differential between the steam and feed water C Which of the following statements represents the function of a turbine gland exhaust condenser? Directs the gland exhaust from the turbine sealing glands to the air ejector suction. Recovers condensate from the gland leakage around the ahead and astern throttle valves. Assists in preheating the condensate before it enters the DC heater. Recovers condensate formed at the gland seal exhaust leak off. A The connections labeled "A" in the illustration, are used to __________. Illustration SG- maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains provide a point of admission for the L.P. bleed steam drain condensate from the feed water heater to the main condenser A The unit shown in the illustration is used as the __________. Illustration SG- combined low-pressure feed heater high-pressure feed heater flash evaporator salt water feed heater Butterworth feed heater B A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG- provide a low-pressure area to guarantee feed water flow to the heater maintain a positive flow of steam as supplied by the main engine LP bleed system avoid the necessity of having to use the condensate pumps force the use of the main condenser as the drain cooler C The items labeled "A" in the illustration are the __________. Illustration SG- low-pressure steam supply connections high-pressure drain connections low-pressure vent connections low-pressure drain connections A The feed water heater shown in the illustration is actually comprised of three separately functioning heat exchangers. These heat exchangers are identified as the __________. Illustration SG- first-stage heater, gland exhaust condenser, and drain cooler drain cooler, distillate condenser, and fresh water drain collector inter condenser, after condenser, and gland exhaust condenser first-stage heater, inter condenser, and after condenser D Which of the following statements is correct concerning the operation of the level or drain regulator associated with the feed water heater shown in the illustration is correct? Illustration SG- The regulator maintains the flow of steam into the first stage heater of this unit. The regulator controls the flow rate of condensate leaving the feed water outlet. The regulator controls the volume of condensate leaving the gland exhaust condenser. The regulator controls the level of condensate collected in the drain cooler section. A The steam separator as used in conjunction with a steam whistle normally drains to which of the listed drain systems? High-pressure Low-pressure Contaminated Main turbine D The function of item "E" shown in the illustration is to __________. Illustration GS- allow steam/condensate or air to be evacuated from the unit as sound is produced act as a reed to enable the production of sound pulse supply steam or air to chamber "M" control the admission of steam into chamber "L" as part of the process to produce sound D What type of sensor is normally used with the automatic recirculating valve in the main condensate line? Pressure Continuity Preset electric timing sensor Thermostatic A The atmospheric drain tank (ADT) normally drains to the__________. main and/or auxiliary condenser distillate tank main and/or auxiliary air ejector condenser reserve feed tanks A Which of the water supplies listed below is typically used as a cooling medium for the gland exhaust condenser, inter condenser, and after condenser of an air ejector unit? Condensate Sea water Potable water Evaporator distillate B If a salinity alarm system indicates 2.5 grains per gallon at the main condensate pump discharge, your first action should be to __________. open the main condensate recirculating valve chemically test the condensate for chloride content increase the hydrazine dosage in the condensate line blow down the boilers and add make up water C Which of the listed conditions will always result in dissolved oxygen being carried over from the main condenser? Priming in the boiler Dumping auxiliary exhaust steam to the main condenser Taking on makeup feed Excessive DC heater temperature C Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded? Reverse-acting relief valve Exhaust piping Check valve Pumps D The DC heater functions to __________. ensure recirculation in the feed water system chemically treat feed water to remove carbonic gas remove the major amount of non-condensable gases from the main condenser store, heat, and deaerate feed water A Cooling water to the vent condenser in a DC heater is supplied by the __________. main and/or auxiliary condensate pump main feed pump salt water circulator feed booster pump A In a main propulsion steam turbine installation, the condensate pump initially discharges to the __________. air ejector condenser distillate tank first stage heater deaerating feed tank A The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________. a water seal line to the packing gland the vacuum in the pump suction an air seal line from the compressed air line special packing in the stuffing box B Condensate pumps have distinctly noticeable characteristics and can usually be recognized by their __________. open impellers and power ends large suction chambers and impeller eyes speed-limiting governors and closed impellers multiple impellers and pump shaft positions D If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be __________. filled with moist air pressurized to approximately 5 psig with nitrogen, 99.5% pure by volume left under a vacuum completely drained of water D Excessively hot water returning to an atmospheric drain tank indicates __________. there is a loss of circulating water the condensate recirculating valve is open a heating coil has ruptured a steam trap is hung open D Scale in the air ejector first-stage nozzle could cause a decrease in the __________. air ejector steam supply pressure low-pressure turbine exhaust temperature condensing temperature in the condenser condenser vacuum A Which of the conditions listed could prevent a centrifugal condensate pump from developing its rated capacity? Closing the water seal line to the packing gland. Venting the pump to the vacuum side of the condenser. Flooding of the main condenser hotwell. Operating the pump with a positive suction head. B While maneuvering out of port, you answer a stop bell. You notice a lot of steam coming out of the gland exhaust condenser vent, in addition to the main condenser hot well level being low. For this condition you should __________. increase steam pressure to the air ejectors manually recirculate condensate and add some makeup feed speed up the condensate pump decrease gland sealing steam pressure D Salt water contamination of condensate could occur at which component? Inter condenser DC heater After condenser Fresh water evaporator A Clean, low pressure steam drains are collected in the __________. atmospheric drain tank main condenser hotwell deaerating feed water heater contaminated drain inspection tank D From which of the areas listed are condensate drains normally collected and returned to the low-pressure drain system? Steam whistle separator/trap Steam systems operating in excess of 150 psi Each main feed pump steam supply line Main and auxiliary air ejector after condensers D A basic comparison can be made between a low-pressure evaporator operation and a main condenser with regards to the removal of non-condensable gases. The vacuum drag line for the main condenser is specifically connected in which area? main tube bank steam lane hotwell air cooler section A Which of the listed systems would be a potential source for the high-pressure drain system? Steam systems operating in excess of 150 psi Fuel oil tank heating coils Laundry steam pressing machines Galley steam tables B Excess free oxygen in the boiler feedwater can be the result of __________. improper operation of the gland exhauster improper operation of the DC heater steam leaks through the turbine glands vapor lock in the boiler feed pump A If the DC heater relief valve lifts frequently, the cause can be excessive __________. auxiliary exhaust steam pressure makeup feed introduced to the system feed water recirculated from the feed pump condensate supplied to the DC heater D Which of the conditions listed may be indicated by the lifting of the DC heater relief valve? Low water level continually maintained in the DC heater. Excessive deaeration of the feed water. Low back pressure in the auxiliary exhaust line. A malfunctioning auxiliary exhaust make-up steam regulating valve. A Excessive water loss from the main feed system can be caused by __________. an atmospheric drain tank trap frozen in the closed position a leak in the desuperheater internal gasket a vapor bound main condensate pump excessive recirculation of condensate from the outlet of the air ejector condenser to the main condenser B In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level? Steam pressure to air ejectors maintained at 10 psig above designed supply pressure. Marine growth on the cooling water side of the main condenser. Condensate recirculating back to the condenser during maneuvering. Steam leaking from the turbine glands. C The water level in a steaming boiler has risen to within 2 inches of the top of the top gage glass. Your immediate action should be to __________. secure the fires and open the bottom blow valve open the surface blow line reduce the feed water flow to the boiler secure the feed water flow to the boiler C On a steam vessel, if a centrifugal main feed pump were operating at shutoff head with the recirculating line closed, which of the following conditions could occur? Excessive diaphragm seal wear in the feed water regulator. Water level in the DC heater would decrease. Flashing at the suction side of the pump. An increased water level in the steam drum. B Air accumulated in the inter condenser of the air ejector assembly is discharged directly to the __________. main condenser after condenser atmosphere high pressure turbine D Which statement is true concerning two-stage air ejector assemblies? Steam to the after condenser is condensed and returned to the main condenser via the loop seal. Air is removed from the condensate as it passes through the tubes. The first stage air ejector takes suction on the second stage to increase vacuum. The steam/air mixture from the main condenser is discharged by the first stage air ejector to the inter condenser. D Serious tube leaks in the air ejector condenser assembly will cause __________. fouled nozzles clogged steam strainers faulty steam pressure loss of vacuum D Why does air entry into the main condenser reduce the efficiency of the steam cycle? The air mixes with the steam and enters the condensate Condensate sub cooling in the main condenser increases Steam flow rate through the main turbine increases Low pressure turbine exhaust steam enthalpy value increases C Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank? Recirculating line to the main feed pump Freshwater cooler Recirculating line to the main condenser Saltwater cooler D Which statement listed represents a vital function of the main condenser? Storage of feed water for immediate use in the boilers. Cooling of the exhaust steam from the auxiliary exhaust system before it enters the deaerating feed tank. Condensing of the exhaust steam from the main feed turbine pumps. The recovery of feed water for reuse. A The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________. a water seal line to the packing gland an air seal line from the compressed air line special packing in the stuffing box the vacuum in the pump suction B If the main condenser were operating at a vacuum of 28.5" Hg, a condensate discharge temperature of 86°F, a sea water inlet temperature of 72°F, and a sea water outlet temperature of 79°F, what would be the condensate depression? Illustration SG- 0.2 inches Hg 4 degrees Fahrenheit 7 degrees Fahrenheit 0.7 inches Hg A Air accumulated in the after condenser of the air ejector unit is discharged directly to the __________. atmosphere inter condenser high pressure turbine main condenser A One of the basic rules applying to the operation of a single-pass main condenser is that the __________. cooling water overboard should be about 10￉F higher than the inlet temperature vacuum must be maintained at 29.92" of Hg. under all operating conditions quantity of reheating steam flow through the condenser must be maintained at maximum under all operating conditions condensate temperature must never be allowed to drop below 104ï¾¹F A Maintaining low pressure in a condensing turbine exhaust trunk __________. enables better utilization of available heat energy to perform work eliminates creep problems in the exhaust trunk during maneuvering reduces condensate depression with low seawater temperature prevents steam turbulence in the exhaust trunk due to steam laning C The connections labeled "A" in the illustration, are used to __________. Illustration SG- provide a point of admission for the L.P. bleed steam drain condensate from the feed water heater to the main condenser maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains B The unit shown in the illustration is used as the __________. Illustration SG- Butterworth feed heater combined low pressure feed heater flash evaporator salt water feed heater high pressure feed heater C A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG- force the use of the main condenser as the drain cooler provide a low pressure area to guarantee feed water flow to the heater maintain a positive flow of steam as supplied by the main engine LP bleed system avoid the necessity of having to use the condensate pumps B The steam separator as used in conjunction with a steam whistle normally drains to which of the listed drain systems? Low pressure High pressure Contaminated Main turbine D Which of the following statements represents the function of a turbine gland exhaust condenser? Recovers condensate from the gland leakage around the ahead and astern throttle valves. Recovers condensate formed at the gland seal exhaust leak off. Directs the gland exhaust from the turbine sealing glands to the air ejector suction. Assists in preheating the condensate before it enters the DC heater. A What type of sensor is normally used with the automatic recirculating valve in the main condensate line? Thermostatic Continuity Preset electric timing sensor Pressure B High pressure and low pressure drain systems are part of the __________. contaminated drain system condensate drain system auxiliary turbine bleed system boiler drain system A Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded? Check valve Reverse-acting relief valve Pumps Exhaust piping B Cooling water to the vent condenser in a DC heater is supplied by the __________. salt water circulator main and/or auxiliary condensate pump feed booster pump main feed pump B In a main propulsion steam turbine installation, the condensate pump initially discharges to the __________. deaerating feed tank air ejector condenser first stage heater distillate tank D The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________. the vacuum in the pump suction special packing in the stuffing box an air seal line from the compressed air line a water seal line to the packing gland B Condensate pumps have distinctly noticeable characteristics and can usually be recognized by their __________. speed-limiting governors and closed impellers large suction chambers and impeller eyes open impellers and power ends multiple impellers and pump shaft positions C If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be __________. left under a vacuum filled with moist air completely drained of water pressurized to approximately 5 psig with nitrogen, 99.5% pure by volume B Vapor blowing from the air ejector condenser vent may be caused by __________. low condensate temperature insufficient condensate flow excessive condensate pump speed excess makeup feed being taken into the system B While maneuvering out of port, you answer a stop bell. You notice a lot of steam coming out of the gland exhaust condenser vent, in addition to the main condenser hot well level being low. For this condition you should __________. speed up the condensate pump manually recirculate condensate and add some makeup feed decrease gland sealing steam pressure increase steam pressure to the air ejectors D Scale in the air ejector first-stage nozzle could cause a decrease in the __________. condensing temperature in the condenser low pressure turbine exhaust temperature air ejector steam supply pressure condenser vacuum B If the cooling water flow through the air ejector intercondensers and aftercondensers is inadequate, which of the problems listed will occur? Air ejector nozzles will erode. Main condenser absolute pressure will increase. DC heater level will rise After condenser will be flooded. C Excessively hot water returning to an atmospheric drain tank indicates __________. there is a loss of circulating water a heating coil has ruptured a steam trap is hung open the condensate recirculating valve is open B Dissolved oxygen in the condensate can result from __________. steam leaks into the gland leak off air leaks through the turbine glands improper operation of the gland exhauster vapor lock in the condensate pump D Salt water contamination of condensate could occur at which component? Inter condenser DC heater After condenser Fresh water evaporator A If the salinity indicator periodically registers high salinity in the main hot well, the cause may be __________. a contaminated distilled water tank leaking air ejector condenser tubes excessive water pressure in the lube oil cooler leaking tubes in the third-stage heater A Which of the conditions listed could prevent a centrifugal condensate pump from developing its rated capacity? Closing the water seal line to the packing gland. Operating the pump with a positive suction head. Venting the pump to the vacuum side of the condenser. Flooding of the main condenser hot well. B Excessive condensate depression can result in __________. high condensate discharge temperature decreased plant operating efficiency insufficient condensate sub cooling overheated air injectors D Which of the following is the advantage of operating a typical closed feedwater system for a marine boiler when compared to an open feedwater system? Reduced requirement for condensate purity. Allows for lower feed pump operating pressures. Reduced steam requirement for feed water heating. Increased capability of removing and controlling dissolved oxygen. B Deaeration of condensate primarily occurs in what section of the illustration shown? Illustration SG- main condenser hotwell DFT distilled water tank first stage feed heater A Which of the listed components would be considered the dividing line separating the condensate system from the feed water system? Deaerating feed tank Main air ejectors Boiler drum Main condenser D The boiler feedwater control valve varies the unity relationship between steam and water flow during periods of __________. steady boiler load minimum boiler load overload operation load change C The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the __________. speed of the impeller impeller ratio of the pump feed water vapor pressure pump capacity in gpm B In the boiler steam and water system, pressure is highest in the __________. dry pipe feed line steam stop mud drum B High-pressure steam drains are normally discharged to the __________. atmospheric drain line DC heater reserve feed tank drain and inspection tank D Which of the listed conditions aids in directing gland leak off steam from the low- pressure propulsion turbine to pass through the gland exhaust condenser? Steam pressure from the low-pressure turbine. Compressed air in the air pilot. Steam pressure from the high-pressure turbine. The use of a gland exhauster fan. C Why is it necessary to have a relief valve protecting the deaerating feed tank from internal pressure? Because the tank receives large amounts of water. Because the tank receives auxiliary exhaust. Because the tank receives high-pressure drains. Because the tank drains to the main condenser. A A high water level in a deaerating feed heater will cause the automatic dump valve to drain condensate to the __________. reserve feed tank main condenser auxiliary condenser atmospheric drain tank D Vent condensers are usually an integral part of deaerating feed heaters and serve to condense __________. the gases liberated by the deaeration process only steam vented from high-pressure steam traps steam vented from high-pressure steam glands the steam vapor entrained with the non-condensable gases C To provide emergency feedwater supply to a steaming boiler, if it becomes necessary to secure the DC heater, suction should be taken on the distilled water tank using the __________. emergency injector discharge feed booster pump emergency feed pump main condensate pump D During cold ship start-up, you should open the feed water outlet and condensate valves to a DC heater in order to __________. expel non-condensable vapors from the vent prevent excessive pressure thoroughly atomize incoming condensate avoid running the feed pump 'dry' B The purpose of the steam control valves installed in the auxiliary exhaust line is to __________. preheat the condensate before it enters the vent condenser control steam admission and maintain the proper steam spray pattern in the DC heater regulate back pressure in the desuperheater line seal the vent condenser to prevent the escape of condensate D With the steam control valve wide open during normal operation, the rate of steam flow from the auxiliary exhaust steam line to the DC heater is actually a function of __________. rate of evaporation in the DC heater water level in the DC heater reservoir spring pressure of the spray valves rate of condensation in the DC heater A The gland exhaust fan draws steam and non-condensable vapors from the gland exhaust condenser and discharges to the __________. atmosphere main condenser vent condenser atmospheric drain tank A To prevent pulsations from developing in the boiler feedwater lines, the discharge side of a reciprocating feed pump is equipped with a/an __________. air chamber relief valve feed water regulator reed valve B If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur? A decreased water level in the DC heater. Flashing at the suction side of the pump. Excessive diaphragm seal wear in the feed water regulator. An increased water level in the steam drum. A The pressure in the feedwater system must exceed boiler steam drum pressure in order to __________. force the feed water into the boiler remove the steam from the steam drum prevent water hammer in the lines prevent air leakage into the feed water system D A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by __________. closing off the steam via the excess pressure pump governor opening wide the recirculating valve and then manually closing the throttle slowly closing the manual throttle hand activating the over speed trip D During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed? Pump suction valve Turbine steam supply valve Turbine exhaust valve Pump discharge check valve D Recirculation of the feed water ensures a flow of water through the __________. third stage heater standby feed pump suction line economizer main feed pump D If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating? A bypass or recirculating line led back to the pump impeller eye or suction. Throttling of the steam supply valve. Throttling of the liquid discharge valve. A bypass or recirculating line led back to the source of suction supply. D Which of the following statements is correct regarding the start-up operation of a non-condensing turbine-driven feed pump? Secure all drains prior to admitting any steam to avoid damage to traps. Keep the steam exhaust valve closed until steam is applied to ensure that the auxiliary exhaust line pressure does not drop. Keep the pump casing vent valve closed until flow is established through the pump. Open the pump suction valve prior to admitting steam to the turbine. B The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine. The admission of steam is normally regulated by a __________. flyweight controlled regulating valve constant pump discharge pressure governor multi nozzle arrangement constant speed limiting governor A Under EMERGENCY operating conditions, the proper valve positions for controlling feedwater to the boiler should be the __________. auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow auxiliary stop and stop-check valves fully open and the feed pump speed used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feed water regulator C In the system illustrated the valves at point "A" are __________. Illustration SG- swing check/stop valves globe valves/gate valves stop-check/stop valves gauge valves/drain valves B When operating with the auxiliary feed line, feedwater flow is controlled __________. automatically by the main feed water regulator manually by throttling the auxiliary feed stop-check valve manually by adjustment of the auxiliary feed water regulator spring setting automatically by the economizer bypass B The main feed check valve functions to __________. reduce feed pump discharge pressure loading prevent backflow of water from the boiler in the event of a feed pump failure check pressure pulsations in the feed line provide feed pump positive discharge head C A boiler feed stop valve must be mounted __________. between the feed pump and the feed check valve at or near the engine room operating platform between the feed check valve and the boiler drum upstream of the feed water regulator D Which piping system is described in the illustration provided? Illustration SG- Auxiliary desuperheated steam system Main superheated steam system Turbine bleed steam system Boiler feed and condensate system D If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed __________. stop valve pump pressure control pump speed control stop-check valve A The boiler main feed stop check valve is located nearest the __________. main feed water regulator inlet DC heater feed water outlet boiler water drum inlet first stage feed water heater outlet C A triple element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________. two-position differential gap action proportional action proportional plus reset plus rate action proportional plus reset action C A two-element boiler feedwater regulator is controlled by __________. steam flow and feed water flow drum water level and drum pressure steam flow and drum water level drum water level and feed water flow C The two-element feedwater regulator functions similarly to the three-element feedwater regulator, but does not utilize __________. water level steam flow measurement feed water flow measurement drum pressure C A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________. two-position differential action on off reset action proportional plus reset action proportional action A A single element boiler feed water regulating system used aboard ship utilizes proportional action proportional plus reset action proportional plus reset plus rate action two-position differential gap action B A major difference between the two element and the three element feed water regulator control systems is that a three element system will additionally measure and incorporate the __________. steam flow to the feed water regulator feed water flow as sensed variable drum water level to the feed water regulator fuel oil flow to the feed water regulator B Which type of feedwater regulator listed provides the MOST effective regulation of boiler water level under all operating conditions? Single-element Triple-element Monothermonic Double-element D When operating with the auxiliary feed line, feedwater flow is controlled __________. automatically by the main feed water regulator automatically by the economizer bypass manually by adjustment of the auxiliary feed water regulator spring setting manually by throttling the auxiliary feed stop-check valve D While underway on watch in the engine room of a steam vessel, the proper valve positions for controlling feed water to the boiler using the auxiliary feed system should be the stop and check valves fully open and the feed pump speed used to regulate the amount of flow the check valve fully open and the stop valve regulated by the feed water regulator the auxiliary check valve fully open and the stop valve used to regulate the amount of flow the stop valve fully open and the auxiliary check valve used to regulate the amount of flow C Which system should be tested and used when required to raise the water level in an idle boiler? Superheated steam system Desuperheated steam system Auxiliary feed system Chemical feed system D If the DC heater relief valve lifts frequently, the cause can be excessive __________. condensate supplied to the DC heater feed water recirculated from the feed pump makeup feed introduced to the system auxiliary exhaust steam pressure D Which of the conditions listed may be indicated by the lifting of the DC heater relief valve? Excessive deaeration of the feed water. Low back pressure in the auxiliary exhaust line. Low water level continually maintained in the DC heater. A malfunctioning auxiliary exhaust make-up steam regulating valve. D In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level? Condensate recirculating back to the condenser during maneuvering. Steam pressure to air ejectors maintained at 10 psig above designed supply pressure. Steam leaking from the turbine glands. Marine growth on the cooling water side of the main condenser. B The water level in a steaming boiler has risen to within 2 inches from the top of the gage glass. Your immediate action should be to __________. secure the fires and open the bottom blow valve reduce the feed water flow to the boiler open the surface blow line secure the feed water flow to the boiler D The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" (25.4 cm) Hg shell vacuum. If the shell vacuum is increased to approximately 16" (40.64 cm) Hg vacuum, the __________. Illustration SG- flow rate of condensate to the feed heater will increase overall plant operating efficiency will increase vacuum in the main condenser will drop as the feed heater shell vacuum increases feed water outlet temperature will decrease B Which piping system is described in the illustration provided. Illustration SG- Auxiliary desuperheated steam system Boiler feed and condensate system Main superheated steam system Turbine bleed steam system D If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed __________. pump pressure control pump speed control stop valve stop-check valve D The boiler main feed stop check valve is located nearest the __________. DC heater feed water outlet boiler water drum inlet first stage feed water heater outlet main feed water regulator inlet A When operating with the auxiliary feed line, feedwater flow is controlled __________. manually by throttling the auxiliary feed stop-check valve automatically by the main feed water regulator manually by adjustment of the auxiliary feed water regulator spring setting automatically by the economizer bypass B A boiler feed stop-valve must be mounted __________. at or near the engine room operating platform between the feed check valve and the boiler drum upstream of the feed water regulator between the feed pump and the feed check valve C The pressure in the feedwater system must exceed boiler steam drum pressure in order to __________. prevent air leakage into the feed water system prevent water hammer in the lines force the feed water into the boiler remove the steam from the steam drum D Which of the following statements is correct regarding the start-up operation of a non-condensing turbine-driven feed pump? Secure all drains prior to admitting any steam to avoid damage to traps. Keep the steam exhaust valve closed until steam is applied to ensure that the auxiliary exhaust line pressure does not drop. Keep the pump casing vent valve closed until flow is established through the pump. Open the pump suction valve prior to admitting steam to the turbine. C Recirculation of the feed water ensures a flow of water through the __________. standby feed pump suction line third stage heater main feed pump economizer B During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed? Turbine exhaust valve Pump discharge check valve Turbine steam supply valve Pump suction valve D A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by __________. opening wide the recirculating valve and then manually closing the throttle slowly closing the manual throttle closing off the steam via the excess pressure pump governor hand activating the over speed trip A Why is it necessary to have a relief valve protect the deaerating feed tank from internal pressure? Because the tank receives high pressure drains. Because the tank drains to the main condenser. Because the tank receives large amounts of water. Because the tank receives auxiliary exhaust. B To provide emergency feedwater supply to a steaming boiler, if it becomes necessary to secure the DC heater, suction should be taken on the distilled water tank using the __________. feed booster pump emergency feed pump emergency injector discharge main condensate pump B High pressure steam drains are normally discharged to the __________. reserve feed tank DC heater atmospheric drain line drain and inspection tank C The purpose of the steam control valves installed in the auxiliary exhaust line is to __________. regulate back pressure in the desuperheater line seal the vent condenser to prevent the escape of condensate control steam admission and maintain the proper steam spray pattern in the DC heater preheat the condensate before it enters the vent condenser A The gland exhaust fan draws steam and non-condensable vapors from the gland exhaust condenser and discharges to the __________. atmosphere main condenser vent condenser atmospheric drain tank C Deaeration of condensate primarily occurs in what section of the illustration shown. Illustration SG- distilled water tank main condenser hot well DFT first stage feed heater B Proper lagging of a single-element feedwater regulator is accomplished by applying the insulation material __________. only as necessary to prevent possible injury to the steam connection, but not water connection to both connections, including finned areas to the water connection, but not steam connection A A two-element boiler feedwater regulator is controlled by __________. steam flow and drum water level drum water level and drum pressure drum water level and feed water flow steam flow and feed water flow D A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________. two-position differential action on off reset action proportional action proportional plus reset action C A single element boiler feed water regulating system used aboard ship utilizes two position differential gap action proportional plus reset action proportional action proportional plus reset plus rate action B The property of a fuel oil which is a measurement of its available energy, is known as its __________. Cetane index heating value viscosity index Cetane number C Which combustible element in fuel oil is considered a significant and major source of air pollution? Hydrogen Vanadium Sulfur Nitrogen D The BTU value of fuel oil is determined by a/an __________. open cup test hydrometer viscosimeter calorimeter D The flash point of a residual fuel oil should be used to determine the highest temperature to which the oil may be heated __________. in the recirculating line for atomizing for centrifuging in a storage tank D Which of the significant combustible elements of fuel oil is a major source of boiler corrosion? Carbon Oxygen Hydrogen Sulfur B The temperature of the fuel oil received during bunkering operations is critical in determining the __________. flash point at which the fuel will burn expansion space to leave in a tank rate at which the fuel can be pumped during transfer operations temperature to which the fuel must be heated B The minimum temperature requirements for fuel oil in storage tanks is related to the __________. size of the vents pump ability of the oil fire point of the oil size of the containment area in case of overflow C According to Coast Guard Regulations (46 CFR), what is the minimum flash point of oil to be used as fuel for the boilers? 80°F (26.7°C) 110°F (43.3°C) 140°F (60.0°C) 150°F (65.6°C) B The main reason for having a low suction line on the fuel oil service or settling tanks is to __________. prevent loss of suction during rough weather facilitate water removal decrease suction head on the pump increase the amount of fuel available for use B The most harmful slag forming compounds found in fuel oils are __________. potassium and nickel vanadium and sodium calcium and silica iron and sulfur A Which constituent of fuel oil determines the specific heat? Hydrocarbons Oxygen Nitrogen Sulfur C When heated, fuel oil will __________. increase in specific gravity increase in viscosity expand in volume have a higher specific heat C Using an oil temperature-viscosity chart, you can determine the recommended __________. oil pressure for smokeless operation fuel/air ratio for efficient combustion oil temperature for proper atomization fuel oil flash point for best combustion A If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what is the weight of air per pound of fuel when operating a boiler at 5% excess air? 14.44 pounds 15.13 pounds 15.81 pounds 16.50 pounds B If the stack temperature is higher than normal, this could indicate __________. high feed water pressure too much excess air external boiler casing leakage low fuel oil back pressure A When testing boiler flue gas with a chemical absorption apparatus, to obtain accurate results __________. prevent any air from contaminating the gas sample analyze for nitrogen content before oxygen content run each analysis for at least 3 minutes purge the apparatus with air before use C The absence of carbon monoxide in the flue gas of a boiler indicates __________. contaminated fuel oil low carbon content of fuel efficient combustion insufficient air C When burning fuel oil in a boiler, a high CO2 content is desired in the stack gas because __________. efficient combustion is indicated and the heat liberated is equal to the heat produced by the formation of CO less excess air is required to produce CO2 than CO more heat is liberated by the production of CO2 than CO efficient combustion is indicated even though the heat liberated is less than the heat produced by burning to CO B Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate. low CO2, no O2, and high CO no CO, low O2, and high CO2 high O2, low CO, and low CO2 high CO, high CO2, and no O2 B A mechanical carbon dioxide recorder operates by detecting the difference between air and the __________. soot content of the flue gases specific weight of the flue gases color of boiler flue gases temperature of the flue gases D A flue gas analysis is performed to determine the __________. specific heat of combustion products percentage of nitrogen by volume carbon content of the fuel being burned correct fuel/air ratio for efficient combustion A Which of the following chemicals is used in an Orsat apparatus to absorb carbon dioxide? Potassium hydroxide Cuprous chloride Pyrogallic acid Potassium chromate D If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately __________. 10.5 (%) 14.0 (%) 21.0 (%) 79.0 (%) B Generally, a 12% to 14% content of carbon dioxide in boiler flue gases indicates __________. too much excess air proper combustion of the fuel oil a high vanadium content in the fuel oil carbon deposits in the uptakes B Which of the following fuel oil characteristics establishes the danger point when transferring, pumping, and firing procedures are concerned? Viscosity Flash point Specific gravity Fire point A Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization? Viscosity Flash point Specific gravity Pour point D Which of the following actions should be taken FIRST when water is found in the fuel oil settling tank? Shift to alternate or standby fuel oil service pump. Determine the extent of water contamination by reading the pneumercators. Sound the settling tank with water indicating paste. Shift pump suction to an alternate settling tank. D When you are transferring fuel oil to the settling tanks, precautions to be observed should include __________. plugging gooseneck tank vents to prevent accidental overflow maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship sounding the tanks frequently and reducing the transfer rate as the level approaches maximum fill A When you are transferring fuel oil from one double bottom tank to another, precautions to be observed should include __________. sounding the tanks frequently and reducing the transfer rate while topping off maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship plugging gooseneck tank vents to prevent accidental overflow maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line C Which of the pumps listed takes fuel oil suction from the double bottom tanks and discharges it to the settling tanks? Fuel oil service pump Centrifugal type general service pump Fuel oil transfer pump Settler service pump C Fuel oil is transferred to the settling tanks for __________. heating to the correct temperature for proper burner atomization purging of any large air bubbles that have formed heating to allow water and sediment to settle out the purpose of removing any volatile gases present in the fuel B The process of breaking up fuel oil into fine particles to ensure good combustion is called __________. settling atomization straining pumping C Which of the terms listed represents the ratio between the highest and lowest fuel oil pressure at which the burners will remain ignited? Modulating band ratio Firing range ratio Turndown ratio Air/fuel ratio D The entire unit which houses the burner, air scoop, air doors and bladed cone is correctly called the __________. air duct assembly burner assembly atomizer assembly register assembly D The component labeled "F" as shown in the illustration is___________. Illustration SG- a permanently installed Orsat apparatus one of the retractable soot blower elements a regenerative air heater one of the main burner assemblies D The property of a fuel oil which is a measurement of its available energy, is known as its __________. viscosity index cetane number cetane index heating value D Which of the significant combustible elements of fuel oil is a major source of boiler corrosion? Hydrogen Oxygen Carbon Sulphur C The most harmful slag forming compounds found in fuel oils are __________. calcium and silica potassium and nickel vanadium and sodium iron and sulphur A The minimum temperature requirements for fuel oil in storage tanks is related to the __________. pumpability of the oil size of the containment area in case of overflow fire point of the oil size of the vents B Which constituent of fuel oil determines the specific heat? Sulphur Hydrocarbons Oxygen Nitrogen B Which combustible element in fuel oil is considered a significant and major source of air pollution? Hydrogen Sulfur Vanadium Nitrogen C The BTU value of fuel oil is determined by a/an __________. open cup test hydrometer calorimeter viscosimeter D The flash point of a residual fuel oil should be used to determine the highest temperature to which the oil may be heated __________. in the recirculating line for centrifuging for atomizing in a storage tank D When testing boiler flue gas with a chemical absorption apparatus, to obtain accurate results __________. run each analysis for at least 3 minutes analyze for nitrogen content before oxygen content purge the apparatus with air before use prevent any air from contaminating the gas sample B The absence of carbon monoxide in the flue gas of a boiler indicates __________. low carbon content of fuel efficient combustion insufficient air contaminated fuel oil D When burning fuel oil in a boiler, a high CO2 content is desired in the stack gas because __________. efficient combustion is indicated even though the heat liberated is less than the heat produced by burning to CO efficient combustion is indicated and the heat liberated is equal to the heat produced by the formation of CO less excess air is required to produce CO2 than CO more heat is liberated by the production of CO2 than CO B A mechanical carbon dioxide recorder operates by detecting the difference between air and the __________. soot content of the flue gases specific weight of the flue gases color of boiler flue gases temperature of the flue gases D A flue gas analysis is performed to determine the __________. percentage of nitrogen by volume carbon content of the fuel being burned specific heat of combustion products correct fuel/air ratio for efficient combustion D Which of the following chemicals is used in an Orsat apparatus to absorb carbon dioxide? Potassium chromate Cuprous chloride Pyrogallic acid Potassium hydroxide C If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately __________. 10.5 (%) 21 (%) 79 (%) 14 (%) C Generally, a 12% to 14% content of carbon dioxide in boiler flue gases indicates __________. a high vanadium content in the fuel oil carbon deposits in the uptakes proper combustion of the fuel oil too much excess air A The temperature of the fuel oil received during bunkering operations is critical in determining the __________. expansion space to leave in a tank flash point at which the fuel will burn rate at which the fuel can be pumped during transfer operations temperature to which the fuel must be heated A When you are transferring fuel oil to the settling tanks, precautions to be observed should include __________. sounding the tanks frequently and reducing the transfer rate as the level approaches maximum fill maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line plugging gooseneck tank vents to prevent accidental overflow maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship A When you are transferring fuel oil from one double bottom tank to another, precautions to be observed should include __________. sounding the tanks frequently and reducing the transfer rate while topping off maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line plugging gooseneck tank vents to prevent accidental overflow B Which of the pumps listed takes fuel oil suction from the double bottom tanks and discharges it to the settling tanks? Centrifugal type general service pump Fuel oil transfer pump Settler service pump Fuel oil service pump A The main reason for having a low suction line on the fuel oil service or settling tanks is to __________. facilitate water removal prevent loss of suction during rough weather decrease suction head on the pump increase the amount of fuel available for use A Which of the following actions should be taken FIRST when water is found in the fuel oil settling tank? Shift pump suction to an alternate settling tank. Shift to alternate or standby fuel oil service pump. Determine the extent of water contamination by reading the pneumercators. Sound the settling tank with water indicating paste. A Fuel oil is transferred to the settling tanks for __________. heating to allow water and sediment to settle out heating to the correct temperature for proper burner atomization the purpose of removing any volatile gases present in the fuel purging of any large air bubbles that have formed B The fins on the tubes of a fin type fuel oil heater are provided to __________. prevent tube erosion increase heater efficiency clean the fuel oil decrease fuel flow C The valve located between the fuel oil header and the burner valve is known as the __________. header valve register valve root valve return valve B Strainers are installed in boiler fuel oil service lines to __________. adsorb water remove solids absorb contaminants decrease viscosity C The boiler fuel oil service pump normally takes suction from the __________. double bottom fuel tanks contaminated drain inspection tank fuel oil settler tank fuel oil heater discharge C The viscosity of a residual fuel oil is measured in Saybolt __________. Milliliters Universal Minutes Universal Seconds Furol Millimeters Universal D The relief valve on the discharge side of the fuel oil service pump may discharge directly to the suction side of the pump, or to the __________. oil header return line fuel oil heater inlet double bottom fuel tank fuel oil settling tank A Pumps normally used for fuel oil service are __________. positive displacement rotary pumps nonvented plunger pumps two-stage centrifugal pumps explosion proof gear pumps A All fuel oil service pumps are equipped with a __________. remote means of stopping the pump combustion control valve on the discharge side relief valve on the suction side direct suction to the double bottom tanks B Fuel oil solenoid valves at the burner fronts should be of the manual reset type to __________. permit the operator to secure each burner during a blackout prevent the furnace filling with oil after restoration of power permit the operator to secure each burner after a blackout prevent the furnace filling with oil during a power failure B All oil-fired main propulsion burners with automatic safety control systems must automatically close the burner valve when __________. the flame in boiler furnace is confirmed actuated by a boiler safety trip the burner is properly seated starting "trial for ignition" D The advantage of a counter flow fuel oil heater, as compared to a parallel flow fuel oil heater, is that the counter flow heater __________. has a larger heat transfer area providing greater heat transfer is not subject to coking if overheated has thinner tube walls providing greater heat transfer produces a higher oil temperature at any given steam temperature B A flame scanner installed in modern boiler combustion control systems, functions to __________. monitor the stack for soot fires monitor the intensity of the burner flame regulate burner fuel oil pressure regulate the air flow to the furnace C When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters __________. before you start the fuel oil service pump before you open the recirculating valve after you start the fuel oil service pump only if the settlers are incapable of heating the oil D Valve "H" shown in the illustration, functions to __________. Illustration SG- prevent a backflow from the manifold recirculate fuel oil during start-up regulate the amount of fuel burned provide a quick shut off of fuel to the boiler A In the majority of marine power plants, the fuel oil heater installations are divided into several units because __________. plant operation can be continued while repairs are being made to a defective unit auxiliary steam is better utilized in this system oil leakage into the condensate system is less likely with multiple system more heating is required for lower loads C Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the __________. forced draft fan dampers air volume regulators fuel/air ratio knob fuel oil back pressure C While trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem? The fuel oil pressure at that burner is too high. The solenoid coil is energized causing the valve to remain closed. The forced draft air supply has failed. The flame scanner is adjusted for excessive time delay in the ignition trial circuit. A A combustion control system diaphragm type air flow transmitter receives its high pressure signal from the boiler __________. wind box furnace fan discharge smoke box C The last two digits stamped on a fuel oil atomizer sprayer plate represents the cross-sectional area ratios of the tangential slots and orifice. This ratio determines the __________. capacity of the atomizer density of the oil spray angle of the cone degree of atomization A What is indicated by the code number 32Y20 stamped on a burner sprayer plate? Sprayer plate orifice was made with a size 32 drill. Sprayer plate requires a size 20 tip. Sprayer plate orifice area is 0.32 square inch. Sprayer plate requires a minimum of 20 psi fuel pressure. C In addition to a nozzle, a fuel oil atomizer uses which of the listed parts? Burner cone Air cone Sprayer plate Ignition electrode A Which atomizing sprayer plate has the largest capacity? 2 PCRS A The number '29' on a fuel oil burner sprayer plate marked '' indicates the __________. orifice size slot cross-sectional area whirling chamber size cross-sectional area ratio A The primary purpose of the sprayer plate in a mechanical atomizing oil burner is to __________. produce a fine, swirling, uniform fuel mist assist in mixing atomizing steam with the fuel completely mix air with the fuel prevent primary air mixing with the fuel A The amount of oil atomized by a straight mechanical fuel oil burner depends on the sprayer plate size and the __________. fuel oil pressure forced draft pressure oil return pressure furnace air pressure B The illustrated burner atomizer assembly is __________. Illustration SG- used in a return flow type burner management system straight mechanical an example of a rotary cup type atomizer used only for variable load steam atomization C In a steam assist fuel oil atomizer, the steam pressure is higher than the oil pressure at __________. design boiler load high fuel viscosity minimum boiler load low fuel viscosity B In most installations, the firing rate of a boiler using steam atomization is indicated by the __________. fuel oil return pressure fuel oil supply pressure burner register opening steam atomization temperature A In a steam assist atomizer, the fuel oil/steam mix takes place entirely within the __________. mixing chamber fuel oil swirlers tangential slots whirling chamber D Compared to the return flow oil burner system, an internally mixed steam atomizer requires __________. higher air velocity higher fuel oil viscosity greater turbulence in the air/oil stream less excess air A The variable capacity pressure atomizing fuel oil burner functions to __________. provide a wide range of combustion maintain smokeless fuel oil atomization maintain a constant fuel temperature provide a constant fuel return pressure B Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because __________. steam maintains the oil at the fire point temperature steam velocity aids in the atomizing of fuel oil over a wide range of fuel pressures atomizing steam pressure is held constant for all load ranges it is not necessary to regulate fuel oil pressure at the burners with this system D According to the illustration, what part number identifies the "air door handle"? Illustration SG- 4 6 7 12 D Which of the following represents the function of the diffuser used with a mechanical atomizing oil burner? Complete the vaporization of the fuel for combustion. Control the amount of secondary combustion air. Finely divide the fuel particles into a cone-shaped spray. Provide flame stability at the atomizer tip. A According to the illustration, what part number identifies the "igniter"? Illustration SG- 2 3 7 9 D What is the purpose of the movable air doors in an air register? Maintain air flow across the forced draft fan. Support the burner distance piece. Regulate the temperature of air entering the furnace. Function to open and close the register. B According to the illustration, what part number identifies the "air doors"? Illustration SG- 1 3 9 4 D In an air register assembly, the majority of air passes through the __________. atomizer assembly diffuser or impeller distance piece stationary air foil or blade cone C According to the illustration, what part number identifies the "diffuser"? Illustration SG- 1 3 9 7 B The purpose of a 'peep' hole in the boiler casing is to __________. check for excess smoke in the stack examine the condition of the flame examine the condition of the refractory cones check the operation of the soot blowers D Which of the following represents the proper color of the flame end farthest from the boiler burner during normal operations? Dark brown Dazzling white Light brown haze Bright yellow or orange A Which of the following procedures represents the proper care of unused burners during low load conditions? They should be removed, cleaned and stored in the rack on the burner bench. They may be left in place, but only if they are clean and if fuel oil is recirculated to provide cooling. They may be left in place, with fuel and steam secured as long as they are not fouled. They should be removed, cleaned, refitted with smaller tips and reinstalled to be ready for immediate use. D To obtain the best mixing of air and fuel with a fuel oil atomizer, you need to adjust the __________. primary and secondary air cones for desired air flow total air volume admitted to the boiler furnace diffuser to the desired flow atomizer position using the distance piece B Which precaution should be observed to prevent damage to the fuel oil service pump when warming up the fuel service system? Bypass the fuel oil meter so that recirculating oil does not register. Close the recirculating valve when the proper atomization temperature is reached. Strip all water from the fuel oil settlers. Heat the fuel oil in the settlers to the atomization temperature. D If one burner of a group of operating steam atomizing burners in a steaming boiler is cut out, the register doors for that burner should be __________. left wide open closed halfway left cracked open closed tightly C To properly remove the burner tip nut from the burner barrel, the barrel should be __________. clamped in a machinist's vice on the work bench fixed in the burner stowage rack held by the fixture on the burner cleaning bench removed from the gooseneck before removing the tip nut D In a boiler furnace, incomplete combustion due to insufficient air yields an excess amount of __________. sulfur dioxide carbon dioxide nitrogen oxide carbon monoxide B Insufficient air for combustion in a boiler furnace could result in a __________. 0% carbon monoxide level black stack smoke emission white incandescent flame high flame temperature C If a boiler is smoking black and increasing the boiler front air box pressure does not reduce the smoke, the cause can be __________. forced draft fan failure high ambient air temperature dirty atomizers heavy soot on tubes C Throttling the burner air register of a lit burner could result in__________. excess combustion temperature in the furnace carbon deposits on the register doors carbon deposits on the furnace walls too much excess air for combustion A Accumulation of fuel oil in the boiler double casing could be caused by _________. dripping atomizers leaking fuel oil strainers high atomizing steam pressure faulty steam atomizer return traps D Excessive accumulation of carbon deposits on a boiler burner throat ring and diffuser could result in __________. a reduced boiler fuel oil pressure increased heat transfer and overheating too much excess combustion air a decrease in boiler efficiency D When a boiler flareback occurs, you should __________. reduce the forced draft blower speed increase the fuel oil supply pressure take the boiler off the line close the master fuel oil valve B Insufficient combustion air supply will cause an atomizer flame to appear as a __________. ragged flame dull red flame with black streaks pointed flame light yellow flame with white streaks A Boiler furnace brickwork can be fractured and broken by thermal shock caused by __________. leaving the registers open on a hot boiler load changes on the boiler while answering bells allowing the furnace to cool too slowly cold feed water passing through the boiler economizer B Which of the conditions listed can cause the flame of a mechanically atomized burner to be blown away from the burner tip when you are attempting to light off? Insufficient excess air is being supplied to the furnace. The diffuser is burned out. Fuel oil viscosity is too low. The secondary air cone is improperly adjusted. B Poor atomization accompanied by an elongated flame from a steam atomization burner is MOST likely caused by __________. improper operation of traps in atomizing steam return piping the fuel oil temperature being too low the forced draft fan too slow for the boiler load an improper Cetane number D Fluctuations in the atomizing steam pressure at the burners could be caused by a/an __________. partially closed atomizing fuel valve partially opened recirculating valve incorrectly assembled air register malfunctioning steam trap in the atomizing steam system D In a multi-burner firebox, a burner tip with a worn and enlarged orifice will __________. cause a high fuel oil return line back pressure cause smokeless and flameless combustion have no effect on the flow of oil if the proper pressure is maintained result in an uneven flow of oil through the burner B If the temperature of the fuel oil entering an atomizer is too low, the burner will __________. require more fuel for atomization produce heavy black smoke at any load condition produce smoke white require more excess air for combustion D If one fuel oil strainer of a duplex unit becomes clogged while the vessel is steaming at sea, the FIRST action should be to __________. clean the dirty strainer as quickly as possible open the strainer bypass valve stop the fuel oil service pump change the oil flow over to the clean side D A leaky fuel oil heater relief valve could be indicated by an increase in the __________. contaminated drain tank level fuel oil service pump pressure sludge tank level discharge piping temperature B Condensate accumulation in the steam side of a fuel oil heater could result in __________. water contamination of the fuel oil reduced heating capacity in an operating heater annealing of the heater tube bundles scale accumulation in an operating heater C The rate of fouling on the oil side of a fuel oil heater is inversely related to the __________. pressure on the oil in the heater shape of the heating coils in the heater flow rate of fuel oil through the heater quality of steam flowing through the heater C If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first? Change over fuel supply to diesel fuel. Bottom blow the boiler using the continuous blow line. Shift over to the standby heater and monitor contaminated drain tank for additional traces of oil. Shift over to the low fuel oil suction on the day tank. A As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to __________. introduce a control for maintaining constant steam pressure regardless of boiler load introduce a control for maintaining constant superheated steam temperature regardless of boiler load control the boiler drum water level within acceptable limits regardless of the load provide a backup means for manual control of the system B When firing a boiler in local manual control, an increase in boiler load must be accompanied by a/an __________. decrease in the forced draft air pressure before a decrease in the fuel oil flow increase in the forced draft air pressure before an increase in the fuel oil flow increase in the fuel oil flow before an increase in the forced draft pressure increase or a decrease in the fuel oil flow and forced draft air pressure simultaneously A In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the __________. steam header pressure burner flame intensity steam drum water level master fuel oil solenoid valve position B In automated boiler operations, a dirty flame scanner will most likely result in __________. loss of forced draft air securing fuel oil to the burner incomplete purge cycle increased fuel oil consumption C When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST? The automatic purge cycle commences. The 'trial for ignition' period commences. The fuel oil solenoid valve is de-energized. The fuel oil service pump is stopped. B A photoelectric cell is installed in an oil fired boiler safeguard system to introduce proper resistance values to the electronic control circuit. This device is primarily sensitive to light emitted from the back wall incandescent brickwork the blue portion of the flame spectrum light emitted from the front wall incandescent brickwork the orange portion of the flame spectrum C Combustion control systems on automatic boilers are designed to prevent immediate burner ignition after a normal or safety shutdown in order to allow time for. the fuel pump to start the drum level to equalize the furnace to be purged electric charge buildup in the igniter B Which of the following represents a significant system limitation to be aware of when a burner management system is operated in the 'HAND' mode? The burner is not capable of maintaining a high firing rate when the boiler is in the 'HAND' mode. Some boiler safety interlocks are bypassed when the boiler is 'HAND' fired. The burner sequence control is fully automatic even in the 'HAND' mode. The flame failure alarm cannot function when the boiler is 'HAND' fired. A In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called __________. biasing relaying loading transmitting C If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an __________. faulty pressure signal to the time delay relay circuit excessively high fuel oil temperature dirty flame scanner window burned out solenoid coil in the low fire oil valve C Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light off. This period may not exceed __________. 5 seconds 10 seconds 15 seconds 30 seconds A In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should __________. secure the burner and determine the cause of the valve failure wedge the valve in the open position and report it to the chief engineer wedge the valve in the open position and reduce the fuel oil pressure at that burner bypass the solenoid valve and enter the fact in the logbook A While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler? The steam pressure will rise. The water level will drop. The water level will rise. The steam pressure will drop. C The relief valve on the discharge side of the fuel oil service pump may discharge directly to the suction side of the pump, or to the __________. double bottom fuel tank fuel oil heater inlet fuel oil settling tank oil header return line B Pumps normally used for fuel oil service are __________. explosion proof gear pumps positive displacement rotary pumps nonvented plunger pumps two-stage centrifugal pumps A Valve "H" shown in the illustration, functions to __________. Illustration SG- provide a quick shut off of fuel to the boiler recirculate fuel oil during start-up prevent a backflow from the manifold regulate the amount of fuel burned D The valve located between the fuel oil header and the burner valve is known as the __________. return valve register valve header valve root valve D The primary purpose of the sprayer plate in a mechanical atomizing oil burner is to __________. assist in mixing atomizing steam with the fuel prevent primary air mixing with the fuel completely mix air with the fuel produce a fine, swirling, uniform fuel mist C The amount of oil atomized by a straight mechanical fuel oil burner depends on the sprayer plate size and the __________. oil return pressure furnace air pressure fuel oil pressure forced draft pressure D The illustrated burner atomizer assembly is __________. Illustration SG- an example of a rotary cup type atomizer used only for variable load steam atomization used in a return flow type burner management system straight mechanical D In a steam assist fuel oil atomizer, the steam pressure is higher than the oil pressure at __________. design boiler load high fuel viscosity low fuel viscosity minimum boiler load B In most installations, the firing rate of a boiler using steam atomization is indicated by the __________. burner register opening fuel oil supply pressure fuel oil return pressure steam atomization temperature C In a steam assist atomizer, the fuel oil/steam mix takes place entirely within the __________. fuel oil swirliers whirling chamber mixing chamber tangential slots B Compared to the return flow oil burner system, an internally mixed steam atomizer requires __________. greater turbulence in the air/oil stream less excess air higher air velocity higher fuel oil viscosity D Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because __________. atomizing steam pressure is held constant for all load ranges steam maintains the oil at the fire point temperature it is not necessary to regulate fuel oil pressure at the burners with this system steam velocity aids in the atomizing of fuel oil over a wide range of fuel pressures B A boiler has a steam delivery capacity of 100,000 pounds per hour, and is equipped with four steam atomizing burners. If the load range of the burners is 4 to 1, this means that __________. the boiler may be operated down to 25,000 pounds per hour only after three burners are

secured the boiler may be operated down to 25,000 pounds per hour without securing any burners all four burners combined can supply up to 400,000 pounds of steam per hour if two burners are operating, steam output will be a minimum of 50,000 pounds per hour C According to the illustration, what part number identifies the "air door handle"? Illustration SG- 6 4 12 7 B According to the illustration, what part number identifies the "igniter"? Illustration SG- 3 2 9 7 A In an air register assembly, the majority of air passes through the __________. stationary air foil or blade cone distance piece diffuser or impeller atomizer assembly D According to the illustration, what part number identifies the "diffuser"? Illustration SG- 7 3 1 9 D The purpose of a 'peep' hole in the boiler casing is to __________. examine the condition of the refractory cones check for excess smoke in the stack check the operation of the soot blowers examine the condition of the flame B The fins on the tubes of a fin type fuel oil heater are provided to __________. decrease fuel flow increase heater efficiency prevent tube erosion clean the fuel oil B When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters __________. before you start the fuel oil service pump after you start the fuel oil service pump only if the settlers are incapable of heating the oil before you open the recirculating valve B Boiler furnace brickwork can be fractured and broken by thermal shock caused by __________. allowing the furnace to cool too slowly leaving the registers open on a hot boiler load changes on the boiler while answering bells cold feed water passing through the boiler economizer A Which of the conditions listed can cause the flame of a mechanically atomized burner to be blown away from the burner tip when you are attempting to light off? The diffuser is burned out. Insufficient excess air is being supplied to the furnace. Fuel oil viscosity is too low. The secondary air cone is improperly adjusted. D Fluctuations in the atomizing steam pressure at the burners could be caused by a/an __________. partially opened recirculating valve partially closed atomizing fuel valve incorrectly assembled air register malfunctioning steam trap in the atomizing steam system B In a multi-burner firebox, a burner tip with a worn and enlarged orifice will __________. cause smokeless and flameless combustion result in an uneven flow of oil through the burner have no effect on the flow of oil if the proper pressure is maintained cause a high fuel oil return line back pressure D If the temperature of the fuel oil entering an atomizer is too low, the burner will __________. require more fuel for atomization produce smoke white require more excess air for combustion produce heavy black smoke at any load condition B A leaky fuel oil heater relief valve could be indicated by an increase in the __________. sludge tank level discharge piping temperature contaminated drain tank level fuel oil service pump pressure B Condensate accumulation in the steam side of a fuel oil heater could result in __________. scale accumulation in an operating heater reduced heating capacity in an operating heater water contamination of the fuel oil annealing of the heater tube bundles D The rate of fouling on the oil side of a fuel oil heater is inversely related to the __________. shape of the heating coils in the heater quality of steam flowing through the heater pressure on the oil in the heater flow rate of fuel oil through the heater C If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first? Change over fuel supply to diesel fuel. Bottom blow the boiler using the continuous blow line. Shift over to the standby heater and monitor contaminated drain tank for additional traces of oil. Shift over to the low fuel oil suction on the day tank. C Flame scanners are used with boiler combustion control systems to monitor flame quality and to __________. secure the fuel oil service pump in the event of a floor fire regulate the fuel/air ratio controller for more efficient combustion shut off the fuel supply if flame failure is detected secure the forced draft fan in the event of a flame failure D The photoelectric cell installed as part of the combustion safety controls of an automatically fired boiler will __________. close the control circuit upon sensing a flame failure open the control circuit upon sensing an intense flame control the modulating pressure control circuit sense light from the burner flame B Which of the following represents a significant system limitation to be aware of when a burner management system is operated in the 'HAND' mode? The flame failure alarm cannot function when the boiler is 'HAND' fired. Some boiler safety interlocks are bypassed when the boiler is 'HAND' fired. The burner sequence control is fully automatic even in the 'HAND' mode. The burner is not capable of maintaining a high firing rate when the boiler is in the 'HAND' mode. A In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called __________. biasing loading relaying transmitting B As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to __________. introduce a control for maintaining constant superheated steam temperature regardless of

boiler load introduce a control for maintaining constant steam pressure regardless of boiler load provide a backup means for manual control of the system control the boiler drum water level within acceptable limits regardless of the load A In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the __________. steam header pressure steam drum water level burner flame intensity master fuel oil solenoid valve position D Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the __________. fuel oil back pressure forced draft fan dampers air volume regulators fuel/air ratio knob B While trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem? The flame scanner is adjusted for excessive time delay in the ignition trial circuit. The forced draft air supply has failed. The fuel oil pressure at that burner is too high. The solenoid coil is energized causing the valve to remain closed. D While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler? The water level will drop. The water level will rise. The steam pressure will drop. The steam pressure will rise. D In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should __________. wedge the valve in the open position and reduce the fuel oil pressure at that burner bypass the solenoid valve and enter the fact in the logbook wedge the valve in the open position and report it to the chief engineer secure the burner and determine the cause of the valve failure C If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an __________. excessively high fuel oil temperature faulty pressure signal to the time delay relay circuit dirty flame scanner window burned out solenoid coil in the low fire oil valve A Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light off. This period may not exceed __________. 15 seconds 30 seconds 10 seconds 5 seconds C Which of the following statements represents the primary function of handholes used on a boiler? To allow access into the steam and water drum. To provide access for cleaning out the firebox. To allow access into the headers. To allow access for cleaning in the stack. C In what section of a boiler would you find a steam quality of 90%? Last pass of the superheater Superheater outlet Steam drum Desuperheater outlet B Circulation of water and the steam/water mixture within a natural circulation boiler is retarded by __________. back pressure in the steam drum acting on the user tubes fluid friction in the downcomers, drums, generating tubes, and headers large changes in steam density high feed water pressure C Arrow "B" shown in the illustration indicates the_________. Illustration SG- retractable soot blower opening uptakes combustion air inlet regenerative air heater B How is boiler water forced to circulate faster in accelerated natural circulation boilers as compared to free natural circulation boilers? Increasing the density of the water. Increasing the inclined angle of the generating tubes. Increasing the surface area of the economizer exposed to the combustion gases. Installing a water circulating pump, such as a hydrokineter. B Steam drum water level indicators must be calibrated to compensate for density differences between the indicated drum water level, and the actual drum water level. If no compensation is made, the indicator will show a __________. lower level than exists in the drum with the error becoming greater as the drum pressure decreases lower level than exists in the drum with the error becoming greater as the drum pressure increases higher level than exists in the drum with the error becoming greater as the drum pressure decreases higher level than exists in the drum with the error becoming greater as the drum pressure increases B Reaching which 'end point' will result in the most severe damage to the boiler? Combustion Circulation Atomization Carryover A As compared with a typical front fired boiler, which of the listed conditions represents an advantage of a top fired boiler? More uniform heat distribution and gas dwell is obtained within the furnace. No division tube wall separating the convection and radiant sections of the furnace is ever required. A lower fuel flow rate can be allowed, thus increasing economy. Superheating diaphragms may be omitted. A Most main propulsion boilers are designed to produce. saturated and superheated steam saturated steam only superheated steam only superheated and supercritical steam B Overheating of the generating tubes will occur when a boiler reaches its end point of __________. combustion circulation moisture carryover evaporation D The required number of pounds of steam generated per hour to develop contract shaft horsepower and maintain the specified pressures and temperatures in the plant, when divided by the number of installed boilers, will give the __________. efficiency of each fire room overload capacity for each boiler efficiency of each boiler full power capacity of each boiler A A natural circulation water-tube boiler, with one or more water drums, would be classified as a/an. drum-type boiler accelerated natural circulation boiler header-type boiler controlled circulation boiler A On a boiler safety valve, the blowdown adjusting ring is locked in place by a __________. set screw locknut wire seal cotter pin A One of the important functions of the superheater safety valves is to __________. protect the superheater from overheating maintain a constant steam flow in the auxiliary steam line maintain a constant steam flow in the desuperheater protect the desuperheater from overheating D When excessive static boiler pressure has resulted in the initial lift of the valve disc, a huddling chamber safety valve will continue to lift open as a result of ___________, steam pressure transmitted through a pipe connected to the superheater outlet an increase in steam velocity through an adjustable orifice ring the resulting reactive force created by the rapid expansion of escaping steam steam pressure acting on the enlarged area of projecting lip or ring C Which of the listed types of safety valves is shown in the illustration? Illustration SG- Pressure-loaded type Nozzle reaction type Huddling chamber type Jet flow type C A boiler safety valve must be capable of __________. closing with a chattering motion to free scale deposits from the seats remaining open until all pressure in the steam drum is relieved remaining open until a preset pressure drop occurs opening gradually above a designated pressure C The primary operational difference between a huddling chamber type safety valve and a nozzle reaction type safety valve is the __________. manner in which steam pressure causes initial valve opening difference in valve relieving capacities principle by which blow down is accomplished manner in which lifting pressure is adjusted A The popping pressure of the safety valve, shown in the illustration, is controlled by the __________. Illustration SG- amount of spring compression feather guide retaining ring adjusting ring position seat bushing adjustment A A boiler accumulation test is used to measure the __________. total relieving capacity of the boiler safety valves steam generating capacity of the boiler blow down pressure of the boiler lifting pressure of the boiler safety valves B Proper bracing and support of the boiler safety valve escape piping is necessary to __________. prevent scale from lodging on the valve seat prevent stressing of the safety valves allow for back pressure formation in the line prevent condensate from accumulating in lines B On a boiler equipped with pilot actuated safety valves, which of the valves listed will be actuated first? Drum safety valve Pilot actuated safety valve for the superheater safety valve Superheater safety valve Pilot actuated safety valve for the drum safety valve D The boiler shown in the illustration, arrow "O" indicates the __________. Illustration SG- main generating tubes superheater tubes screen tubes soot blower elements A The purpose of the cam-actuated steam valve used in a boiler soot blower system is to __________. prevent steam from entering the soot blower when the element holes are directed toward the refractory rotate the element through a predetermined blowing arc automatically secure steam to the blower head any time the element stops turning automatically blow the elements in the proper sequence D The purpose of the pressure control disk installed in the multi-nozzle soot blower, as shown in the illustration, is to __________. Illustration SG- control the pressure exerted on the valve spring retainer control the pressure exerted on the steam valve disk when the cam secures the steam supply increase the pressure in the steam supply line for proper soot blower operation reduce the steam supply pressure to the soot blower element D The glass used in a flat-type boiler water gage is protected from the hot steam and water by a/an __________. asbestos gasket copper insulator felt cushion mica shield D Bi-color water level indicators, connected directly to the boiler drum, operate on the principle of __________. different chemical properties of steam and water special insoluble indicating fluids different densities which result from the comparison of the varying steam pressure in the drum different refractive properties of steam and water D The items labeled "D" and "M" as indicated on the illustration are commonly called __________. Illustration SG- cork gaskets glass inserts face plates mica sheets A In a boiler water gage glass, a ball check valve is installed on the __________. bottom connection only top and bottom connection top connection only drain valve C The purpose of the mica used in a boiler water gage glass assembly is to prevent __________. light refraction in the glass leakage from the glass etching of the glass overheating of the glass A The main steam stop valve on a "D" type marine boiler is located at the __________. superheater outlet desuperheater outlet desuperheater inlet superheater inlet C A secondary function of the refractory installed in a marine boiler is to __________. support the boiler casing support the burner distance piece direct the flow of combustion gases maintain air flow through the burner diffuser A Boiler refractories previously baked out and fired are most sensitive to __________. rapid cooling sustained high furnace temperature radiant heat of the burner rapid heating B An advantage of using boiler furnace studded water wall tubes packed with refractory is that __________. thinner tubes can be used the use of dense firebricks is not required thicker tubes are required lower quality steel can be used C The useful life of furnace refractory is affected most by __________. the quality of the fuel being burned improper treatment of boiler water large and rapid changes in furnace temperature high steady steaming boiler loads B A corbel is used in a boiler furnace to __________. direct the flow of gases protect the expansion joints reduce gas turbulence contain the furnace heat A Which of the listed refractory materials is capable of providing structural stability? Firebrick Insulating brick Chrome castable Insulating block C According to the illustration of a typical boiler furnace rear wall, which item number would best represent "standard fire brick"? Illustration SG- 1 2 3 7 B When heated, brickwork in a boiler is kept from buckling by the installation of __________. sliding saddles expansion joints insulating bricks insulating blocks A According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating brick"? Illustration SG- 1 2 3 7 D Which of the following statements represents the function of insulating brick? Acts as a gas-side layer at high temperature areas in D-type boilers. Provides structural stability. Provides the first layer at the inside of inner casing. Acts as backup insulation behind firebrick, plastic refractory, or castable refractory. B Which of the following statements represents the advantage of using a small diameter boiler tube over a larger diameter tube? Small diameter tubes reduce the heating surface area. Small diameter tubes reduce gas turbulence in the tube banks. Small diameter tubes provide for greater heat transfer rates. Small diameter tubes are less affected by the insulating properties of soot. A The advantage of installing waterwall tubes in a boiler furnace is to __________. permit higher combustion rates increase heat transfer to the mud drum decrease the flow of gases through the furnace increase the flow of gases through the furnace B The component lettered "J" shown in the illustration serves as a __________. Illustration SG- screen tube header side water wall header support beam water drum A The boiler shown in the illustration has its screen tubes connecting the steam drum and the component labeled __________. Illustration SG- I F G D C In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because __________. their main function is to retard combustion gas flow for maximum heat transfer rates they must screen the superheater from the direct radiant heat of the burners they require more water flow since they are exposed to the greatest heat they must act as downcomers to ensure proper circulation C In a D-type boiler, which of the tubes listed would be located in the generating tube bank? Waterwalls Recirculating tubes Superheater support tubes Downcomer tubes A Which of the tube types listed can be considered to serve as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers? Superheater support tubes Water screen tubes Water wall tubes Riser tubes D In the boiler shown in the illustration, the arrow "E" indicates a __________. Illustration SG- support tube recirculating tube water wall tube downcomer B The device shown in the illustration is a/an __________. Illustration SG- air ejector desuperheater deaerator eductor D Desuperheated steam can be found at the __________. high-pressure turbine steam chest main steam stop generator steam stop spray attemperator outlet C Which of the following locations could desuperheated steam be considered to occur? Spray attemperator Main engine extractions Both "A" and "B" Neither "A" nor "B" D The primary purpose of a control desuperheater installed in the steam drum of a boiler is to __________. regulate the temperature of superheated steam by adding moisture assure a constant volume of steam flow through the entire superheater under all load conditions regulate saturated steam temperature through the desuperheater regulate the superheater outlet temperature by cooling a portion of the superheated steam C That portion of the steam drum, containing a manhole for internal access to the drum, for the purpose of cleaning, inspecting, and carrying out repairs, is called the __________. wrapper sheet tube sheet drumhead end plate B Which of the following statements concerning boiler steam drum surface blow piping is correct? The centerline of the pipe is normally situated at a distance from the bottom of the steam drum equal to approximately one-fourth the diameter of the drum. Usually the surface blow pipe is perforated with holes along its top surface; however, when a scum pan is also employed, the holes are located along the bottom of the pipe surface. To ensure adequate blow down, the aggregate cross-sectional area of these perforated holes must be equal to approximately twice the cross-sectional area of the pipe. All of the above. D The purpose of the boiler drum air cock is to __________. admit air when the boiler is being emptied permit escape of air when the boiler is being filled permit escape of air when steam is forming in the drum after lighting off All of the above. C Steam baffles are used in the steam drum of a water-tube boiler to __________. extend the internal feed pipe remove boiler water dirt deposits reduce the possibility of carryover support the drum safety valve nozzles B The boiler wrapper sheet, shown in the illustration, is indicated by arrow __________. Illustration SG- A B H I D The main purpose of the boiler steam drum component shown in the illustration is to __________. Illustration SG- reduce vibration reduce the possibility of priming permit expansion during pressure surges prevent thermal shock D Where is the 'dry pipe' located in a boiler? At the superheater outlet Behind the superheater screen tubes Below the generation tube bank In the top of the steam drum A Which of the following statements represents one operational characteristic of a cyclone steam separator? Unit imparts a rotational motion to the steam and water mixture. Steam is forced to the outer side of the separator by centrifugal force. Unit reduces the circulation of the steam and water mixture in the boiler. Water is forced upward by centrifugal force. C A boiler internal feed pipe is perforated to __________. reduce the weight of the steam drum internals create a slight turbulence in the steam drum distribute water evenly throughout the steam drum provide positive flow to the downcomers B Which of the devices listed is indicated by arrow "H" shown in the illustration? Illustration SG- Overdeck superheater Economizer Air heater Steam soot blowers B Boiler fuel savings gained by the use of an economizer can amount to __________. one-half percent for each 15°F rise in feed water temperature one percent for each 10°F rise in feed water temperature three percent for each 5°F rise in feed water temperature three percent for each 20°F rise in feed water temperature B Which of the conditions listed could cause steam formation in the economizer? Soot buildup on the gill rings. Sudden large increase in the firing rate. Excessive water flow rates. An open main feed pump recirculating line. A The boiler economizer provides additional heat to the __________. feed water entering the boiler steam leaving the superheater fuel oil entering the furnace air supply entering the furnace C A check valve is located between the economizer and the steam drum to __________. assure a positive feed water flow through the economizer prevent the feed pump from becoming vapor bound prevent steam and water flow reversal from the drum should an economizer casualty occur assure a positive feed water flow to the steam drum B The minimum feedwater inlet temperature to a boiler economizer is determined by the __________. superheater outlet temperature dew point temperature of the stack gas surface area of the third stage heater radiant heat transfer in the furnace D The turbo-generator steam stop is located between the superheater outlet and the main steam stop valve to __________. provide for easier access provide higher quality steam for the turbo-generators provide a flow of cooling steam through the control desuperheater allow the use of superheated steam in the turbo-generator without pressurizing the larger main steam line A The main steam stop bypass valve is used to __________. gradually increase the pressure and temperature of the main steam piping when warming up supply auxiliary steam when the main steam stop is closed isolate the main steam stop for repairs while steaming cross-connect two steaming boilers D Scavenging air is supplied to steam sootblower elements to __________. prevent buildup of soot on the element provide cooling air when soot blower elements are rotating through blowing arcs prevent overheating of adjacent tubing prevent back up of combustion gases into soot blower heads D In a boiler equipped with a convection type superheater, the superheater tubes are located __________. between the economizer and generating tubes between the downtake nipple and circulator tube in the path of the radiant heat of combustion in a position screened from the furnace D The boiler superheater shown in the illustration is a/an __________. Illustration SG- horizontal U-type overdeck convection-type overdeck integral-type vertical U-type C Which of the devices listed is shown in the boiler illustration? Illustration SG- Separately fired superheater Regenerative air heater Integral or interdeck superheater Retractable soot blower B Boiler superheaters are designed to __________. raise the latent heat of the steam raise the sensible heat of the steam increase the overall mechanical efficiency of the plant provide continuous steam flow to the control desuperheater B Which of the types of superheaters listed has the flattest superheat temperature curve? Convection Radiant-convection Radiant Conduction-convection A Where is the superheater located in the boiler shown in the illustration? Illustration SG- G H I J A In a regenerative air heater, air is bypassed around the heater while __________. operating at low steaming rates crossing over forced draft fans giving a surface blow blowing tubes C The bottom blow valve on a water-tube boiler is usually attached to the __________. steam and water drum external downcomers boiler mud drum floor tubes A When increasing the firing rate of a boiler, which of the following should be carried out FIRST? Increasing the forced draft air pressure. Increasing the fuel pressure. Increasing the feed water flow. Decreasing the steam pressure. A To safely decrease the boiler firing rate, you should always reduce the fuel pressure __________. before reducing the forced draft pressure after reducing the forced draft pressure by opening the oil recirculating valve by opening the fuel pump relief valve B Which of the following items should be checked each time the firing rate or forced draft pressure is adjusted? Atomizing steam pressure Smoke periscope Fuel oil suction pressure Fuel oil heater inlet temperature D As the percentage of CO2 in the stack gas decreases, you can assume that __________. the fuel to air ratio is increasing fuel is being burned with increasing economy you are approaching secondary combustion excess air is increasing D One factor for determining the minimum feedwater inlet temperature to a boiler economizer is the __________. desuperheater outlet temperature temperature of steam bled off the LP turbine superheater inlet temperature dew point temperature of the stack gases B When answering a full astern bell from half ahead, the superheater outlet temperature on a single furnace boiler will __________. remain the same decrease due to the increase steam volume used increase sharply with the increased firing rate decrease momentarily and then increase proportionately with load demand B If there is a sudden drop in the outlet temperature of an uncontrolled superheater, you should __________. increase the firing rate check for high water level in the drum bypass the air heater reduce the forced draft fan speed D Which of the valves listed should be closed before lighting off a boiler? Superheater vent valve Superheater drain valve Air cock valve Economizer drain valve A Which of the following precautions should be taken prior to lighting off a boiler? Purge the furnace of combustible gases. Bottom blow the mud drum. Secure the main steam line drains. Close the air register. A Many steam plants are designed so that diesel oil can be provided to the burners when __________. lighting off a cold ship heavy smoking persists overload capacity is required a heavy fuel must be blended A Steam assist fuel atomizers are converted to straight mechanical atomizers in order to __________. cold start a boiler with diesel oil raise steam on the idle boiler meet minimum boiler steam demands provide the best fuel economy D The superheater vents should always be open when __________. blowing down the boiler the water level is lower than normal blowing tubes lighting off the boiler C Why should the fuel oil be recirculated before lighting off a cold boiler? To allow the fuel strainers to thoroughly clean the fuel. To allow fuel pressure to buildup gradually. To heat the fuel enough for proper atomization. To ensure that all water is removed from the fuel. A Prior to lighting a burner in a cold boiler, you should __________. thoroughly purge the furnace open the surface blow valve blow down the mud drum close the superheater vent D If a boiler is brought on the line with its steam pressure much higher than that of the boiler already on the line, there is danger of __________. low water an overloaded superheater thermal shock priming and carryover B While raising steam on a cold boiler, the air cock is to be closed after __________. the economizer drain is closed steam has formed and all air is vented the boiler is cut in on the line all burners have been lit and firing normally A When raising steam on an idle boiler and the steam pressure has risen to about 5 pounds more than the pressure of the boiler already on the line, you can __________. put the boiler on the line close the superheater vent increase the boiler firing rate close the air cock B The time taken to raise steam on a cold boiler should always be. not less than a full 24 hours the time specified by the boiler manufacturer not more than 1 full hour as short as possible to avoid excessive thermal expansion A When preparing to cut a boiler in on the line, you determine that the steam pressure of the incoming boiler is about 5 psig above line pressure. Which of the following steps should you take next? Open the desuperheated steam stop. Test the hand relieving gear. Open the superheater vent. Light off additional burners. A After steam has been raised and a boiler is being placed on the line, the superheater vent can be closed when __________. the boiler is supplying auxiliary steam the boiler steam stops have been warmed up main and auxiliary steam line drains are opened boiler pressure is 5 psi above line pressure D When raising steam on a boiler, the superheater drains should __________. be closed until just before line pressure is reached, and then given a short blow period be opened to remove condensate, and then closed when the first burner is lit be closed until after the air cock is closed, and then opened until the boiler is placed on line remain open or partially open until steam blows through the lines, and then the valves should be closed D When raising steam on a cold boiler under normal conditions, you should always __________. use a large orifice burner sprayer plate to start take 24 hours to raise steam raise steam within one hour or less use a small orifice burner sprayer plate to start D Which of the following statements about boilers is correct? The water level in a properly operated boiler will not shrink or swell. No boiler will continue to generate steam after the fires are secured. Loss of water will not harm a boiler if the water level can be restored. A hot boiler will continue to generate steam after the fires are secured. B When a boiler has been secured and is being initially cooled, the water level showing in the steam drum gage glass should be __________. allowed to drop naturally maintained at the normal level allowed to go out of sight maintained at a full glass D After a boiler has been taken off the line and is cooling, the air cock is opened to __________. purge all air from the steam drum guard against entrapped gas pockets in the superheater allow even cooling of the steam drum prevent the formation of a vacuum within the boiler A Which of the valves listed should be closed before lighting off a boiler? Economizer drain valve Air cock valve Superheater vent valve Superheater drain valve B If a boiler is brought on the line with its steam pressure much higher than that of the boiler already on the line, there is danger of __________. low water priming and carryover an overloaded superheater thermal shock D Which of the following is the best reason for opening the air cock when draining a water-tube boiler? Water flows out of the boiler too rapidly with the air cock closed. Air mixed with the water will create a cleansing effect in the tubes. Air coming into the boiler will help dry out the boiler's surface. With the air cock open, the boiler drains without producing a vacuum. A A boiler is to be secured in port. After the burners have been secured, the forced draft fan and air registers should be secured __________. after any oil on the furnace floor has been burned off and cleared of combustion gases after at least 1 hour has elapsed, after carrying out these securing procedures after 30 minutes has elapsed, after carrying out these procedures immediately after carrying out the former procedures C Which of the actions listed should be carried out immediately after securing the fires in one boiler of a two boiler ship? Open the air registers wide to cool the furnace. Secure the main feed pump. Relieve all fuel oil service pressure to that boiler. Drain and refill the boiler with cold water. C Before blowing tubes in a boiler equipped with steam soot blowers, you should __________. decrease the boiler water level lower the boiler steam pressure increase the boiler water level reduce the forced draft fan speed D Before using a boiler compressed air soot blower system, you should __________. decrease the forced draft fan speed lower the water level reduce the boiler pressure drain the soot blower pneumatic operating lines D To avoid acid corrosion of the economizer tubes when blowing tubes. lower water level raise boiler pressure lower boiler pressure drain the soot blowers headers D After routine blowing of tubes at sea, there should be a decrease in the __________. CO2 in the stack gas fuel oil temperature excess air required for complete combustion stack temperature B When cleaning the waterside of boiler tubes with a powered rotary brush, the brush should be kept in motion to __________. reduce tube pitting avoid internal tube damage reduce wear to brush bristles prevent it from seizing A If while filling the boiler a newly installed gasket on a water-tube hand hole plate weeps, you should __________. center and tighten with correct size wrench coat the gasket with graphite use a double gasket retighten the stud nut with an air wrench D When a propulsion boiler is removed from service for an extended period, why should the firesides be thoroughly dried after water washing? Prevent flarebacks on lighting off. Reduce the possibility of thermal spalling. Prevent cracking of the brickwork. Reduce the probability of corrosion. A The correct method of expanding a generating tube at the boiler drum tube sheet is to roll __________. to a depth greater than the thickness of the drum tube sheet slightly at the tube end prior to welding the tube to the drum tube sheet to a depth less than the thickness of the drum tube sheet heavily at the tube end prior to welding the tube to the drum tube sheet C Which of the following repairs should be made to a badly warped boiler tube? Assure that the warped tube does not touch adjacent tubes and then reroll it in the header. Use a hydraulic jack to cold bend the tube. Replace the tube with a spare, if available, or plug it. Heat the tube and use a soft mallet to straighten it. B A hole should be made in the sagged tube occurring in a water-tube boiler, prior to plugging the tube to prevent a __________. crack failure of the tube pressure buildup in the tube complete sagging failure of the tube quick burnout of the tube D To prevent a small plastic refractory wall patch repair from falling into the furnace of a D-type boiler, you should __________. mix the plastic with concrete prior to using reinforce the patch with fine mesh metal screen attach anchor bolts to the furnace casing undercut the existing brick around the area to be patched D When drying and baking are impractical, or time is not available, which of the listed materials could be used to repair both burner openings and gas baffles? Baffle mix Plastic chrome ore Plastic fire clay High temperature castable refractory B To make temporary emergency repairs to brickwork in a boiler furnace, which of the materials listed should be used? Calcined diatomaceous earth Plastic refractory Insulating block Air setting mortar A Radial cracks have developed in the castable refractory of the burner cones after the first firing since the installation of new furnace front refractory. This is an indication of __________. relieved stresses a need for castable refractory patchwork inadequate cone angle a need for plastic firebrick patchwork B To assure a long service life for boiler refractory materials after installation, the most effective method is to __________. maintain a high furnace temperature at all times avoid rapid temperature changes and follow recommended operating procedures properly secure refractory with anchor bolts patch refractory with plastic chrome ore C When installing new safety valve escape piping, precautions should include assuring that __________. the piping leads directly to the bilge the quick-closing valve operates freely no stress is transmitted to the valve bends or elbows in the line do not exist B Improper water washing of the water-tube boiler firesides can cause __________. erosion of tubes and drums sulfuric acid corrosion decreased heat transfer capabilities loss of ductility in boiler tubes C Which procedure should be followed to dry out the fireside of a boiler after water washing? Place trays of silica gel in the furnace. Use a wire reinforced steam hose to put superheated steam in the furnace for 6 hours. Alternately fire one burner for 15 minute intervals during a 5 hour period. Open the furnace registers and run the forced draft fans for 3 hours. D The boiler water gage glasses should be blown down __________. when the boiler water level changes in a steaming boiler every 12 hours of steady boiler steaming operation twice each day on the midnight and afternoon watches when you are in doubt about the water level B To properly blowdown a boiler gage glass, you should __________. blow through the top (steam) connection first blow through the bottom (water) connection first take up snugly on upper and lower gage glass packing nuts prior to blowing down never disconnect the chains that connect the upper and lower cut out valves C In the absence of the manufacturer's instructions, a good procedure in reassembling a high-pressure boiler gage glass is to tighten the nuts in pairs and __________. begin with the end bolts and work toward the center start at the top and work down begin with the center bolts and work toward the ends start at the bottom and work up D You are standing watch in the engine room of a steam vessel. You should blow down a gage glass periodically to __________. maintain the proper water level in the steam drum provide water samples for the second assistant test the feed water stop-check valve remove any sediment that has accumulated C While your vessel is underway at normal speed, a steam drum safety valve develops a significant leak. Your first corrective action should be to __________. secure the boiler and blank off the valve flange inspect the escape piping for binding on the valve body attempt to reseat the valve using the hand releasing gear secure the boiler and check the valve spring compression D Lower than normal steam pressure in an operating boiler may be caused by __________. boiler water contamination a sudden drop in superheater outlet temperature high feed water temperature a low water level in the steam drum A Water in the fuel supply to a steaming boiler can be detected by __________. sputtering of the fires observation of the fuel oil heater drains panting of the casing dense white smoke being observed in the periscope A Before an explosion can occur in a boiler furnace, there must be an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a __________. source of ignition for the explosive mixture space large enough for the explosion to occur high steam demand on the boiler ground in the burner ignition electrode A What is the cause of 'laning' in a boiler tube bank? Excessive slag accumulation on the tubes Low fuel oil pressure Reduced furnace volume Insufficient air flow B Which color burner flame would indicate too much excess air? Yellowish orange Incandescent white Orange red Bright red A Lower boiler efficiency results from carrying too much excess air because __________. it increases the volume and temperature of the furnace gas leaving the stack it decreases the volatility of the fuel the flame temperatures are lower it varies the degree of deposits on heat absorbing surfaces C If the flue gas oxygen content is too high, you should __________. increase the forced draft fan speed increase the fuel oil temperature adjust the combustion control system adjust the fuel oil service system A A higher than normal stack gas temperature could indicate __________. dirty firesides or watersides eroded water screen tube walls inner or outer casing leakage defects in burner cone refractory B While the vessel is rolling in heavy seas, the level in the boiler gage glass remains steady, this is an indication that __________. the water level in the steam drum is too low there is most likely an obstruction in the lower valve the steam drum is adequately baffled the gage glass is functioning normally B Which of the following actions, if any, should be taken if the water gage glass on a steaming boiler breaks? Reduce the firing rate. Close the gage glass cutout valves. Close in on the feed stop-check valve. No action is necessary since checks in the cutout valves automatically seat to stop loss of steam and water. D If the engineer on watch has reason to doubt the accuracy of the water level shown in the boiler gage glass, he should __________. speed up the main feed pump open the auxiliary feed line start the standby feed pump blow down the gage glass C An obstruction in the top connection of a boiler gage glass will cause the __________. gage glass to overheat and break gage glass to be blown empty water level to rise slowly in the glass water level to remain constant in the glass C If the engineer on watch has reason to doubt the accuracy of the water level showing in the boiler gage glass, he should FIRST __________. start the standby feed pump open the auxiliary feed line blow down the gage glass replace the gage glass D Boiler tube failures can result from __________. mechanical stress overheating corrosion All of the above. A Why are hard scale deposits on the inside of boiler tubes most objectionable? Poor heat transfer due to hard scale deposits overheats tubes. Flow of water within the tube is restricted. Hydroxyl ions liberated by the scaling process form acid in the boiler water. The metal of the tube interior is eaten away by scale. D The MOST common cause of heat blisters developing on boiler generating tubes is due to__________. flame impingement gas laning insufficient water circulation waterside deposits B Oil or scale deposits on boiler tube walls will cause __________. decreased boiler steam pressure those tubes to overheat increased boiler steam pressure an explosion in the boiler C If a boiler tube bank baffle carries away, or burns through, there will be __________. fireside burning of boiler tubes excessive gas turbulence in the furnace localized overheating of the water drum incomplete combustion D Excessive foaming in a steaming boiler can cause damage to the __________. internal feed pipe economizer desuperheater superheater A In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by __________. high solids content and foaming in the drum high feed water temperature ruptured feed water control valve diaphragm low feed water temperature C Oil accumulation in boiler water would __________. increase the heat transfer rate practically eliminate boiler sludge formation cause foaming and carryover from the boiler prevent acid attack on the boiler tubes C Damaging scale can form on the interior of superheater tubes as a result of __________. high superheater outlet temperature insufficient steam flow through the superheater boiler water carryover leaks from the desuperheater D Under otherwise normal steaming conditions, an abnormally high temperature at the superheater outlet of a single furnace boiler would indicate. high steam demand insufficient combustion air excessive steam supply to fuel oil heaters poor heat transfer in feed water heaters C A heavy accumulation of soot on the fireside of the superheater can cause a __________. high superheater outlet temperature because of gas laning high superheater outlet temperature because of reduced steam flow low superheater outlet temperature because of the insulating effect of soot high superheater inlet temperature because of decreased heat transfer C Insufficient combustion air supply to the furnace would cause __________. high feed water consumption the fires to sputter low superheater outlet temperature high stack temperature D If a pressure drop does not exist across the superheater in a steaming boiler __________. the feed water temperature is too low this is a normal condition the drum safety valve is about to lift ahead of the superheater safety there is no steam flow through the superheater B Which of the listed conditions can cause high superheater outlet steam temperature in an automated boiler? Insufficient excess air. Operating with a bypassed economizer. Excessive heat transfer in the control desuperheater. High water level in the steam drum. B Slag buildup on boiler furnace refractory is undesirable because it causes __________. fracturing of the anchor bolts peeling or spalling of the brickwork excessive cooling of the brickwork shrinking of the brickwork D Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall? The brickwork has become slagged. The insulation block has become slagged. The corbels have failed. The furnace brickwork has collapsed in that area. A Which of the following problems can occur when an excessive number of water screen tubes are plugged? Superheater outlet temperature will rise. Steam pressure leaving the drum will increase. Superheater outlet pressure will rise. Steam temperature in the drum will decrease. A Which of the conditions listed occurs when glassy slag, formed by the burning of fuel oil contaminated with salt water, melts and runs over the furnace wall? Damage to the furnace refractory. Cracks through the furnace floor. Increased furnace temperature. Formation of a protective coating. C Which of the following would indicate a moderate leak in the desuperheater? Lower than normal fuel oil consumption Higher than normal fuel oil consumption Lower than normal auxiliary steam temperature Higher than normal auxiliary steam pressure B Which of the conditions listed could cause a boiler economizer to leak? Low feed water pressure. Water hammer. High feed water temperatures. High stack gas temperatures. B Which of the conditions listed would indicate excessive soot buildup on the economizer? Low air temperature entering the boiler High superheater temperature Lower than usual air pressure in the furnace High feed water temperature entering the boiler A If a soot blower element does not revolve freely, the most likely cause would be __________. warpage of the soot blower element an improper blowing arc cam setting insufficient steam pressure to the soot blower element a seized blower head bearing C A nozzle reaction safety valve will lift at a pressure lower than required if the __________. nozzle ring has come adrift adjusting ring is set too low spring compression is insufficient blow down is set too low C If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape? Escape through another compartment on a higher level. Use fire room elevator to an upper deck. Escape through another compartment on a lower level. Escape by way of a fire room ladder to the outer deck. B Which of the precautions listed should be taken when gagging a boiler safety valve? Tighten the gag only with the special wrench supplied with the gag. Tighten the gag only finger tight to prevent damage to the valve stem, disc or seat. Ensure that all moving parts of the safety valve are free to move before installing the gag. Do not allow the gag to contact the safety valve stem. C If a major flareback occurs to a boiler, which of the following actions should be immediately taken? Secure all fire room ventilation. Secure the forced draft fan. Secure the fuel to the burners. Purge the fuel oil system. A If the water level in one boiler of a two boiler plant rapidly falls out of sight, which of the following actions should be carried out FIRST? Secure the fuel oil to that boiler. Secure the steam stop to that boiler. Blow down the gage glass. Raise the feed pump pressure. D Which of the following actions should be carried out if the boiler water level is falling due to a tube failure? Open the auxiliary feed stop and check for extra feed. Speed up the feed pump to keep the water level up while firing the boiler. Start the standby feed pump and feed the boiler using two feed pumps. Secure the fires and try to maintain the water level. A Which action should be taken if the water level in the boiler gage glass drops out of sight and the burners fail to secure automatically? Trip the master solenoid. Repair the feed water regulator. Increase the feed pump speed. Blow down the gage glass. C After restoring the normal water level in a boiler following a high-water casualty, you should __________. immediately drain the economizer immediately put the boiler on the line completely drain the superheater blow down the water gage glass A Under EMERGENCY operating conditions, the proper valve positions for controlling feedwater to the boiler should be the __________. auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow auxiliary stop and stop-check valves fully open and the feed pump speed used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feed water regulator D In the event of a failure of the pneumatic control system, a multi-element feedwater regulator is designed to operate as a __________. constant-volume feed water regulator constant-pressure regulator thermo-hydraulic feed water regulator manually controlled feed water regulator A One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to __________. secure the feed water supply to the boiler close the main steam stop secure the forced draft fans stop the fuel oil service pump C The boiler wrapper sheet, shown in the illustration, is indicated by arrow __________. Illustration SG- A H B I A In what section of a boiler would you find a steam quality of 90%? Steam drum Desuperheater outlet Superheater outlet Last pass of the superheater A Steam baffles are used in the steam drum of a water-tube boiler to __________. reduce the possibility of carryover support the drum safety valve nozzles remove boiler water dirt deposits extend the internal feed pipe A The internal feed pipe in a D-type marine boiler __________. distributes feed water evenly throughout the steam drum is drilled with holes to provide even distribution of boiler feed water chemicals is located well above the normal steam drum water level to assist in deaeration of feed water guides the feed water toward the downcomer tubes C Which of the following statements represents the purpose of boiler sliding feet? To ensure an airtight seal between the boiler inner and outer casings.

o To compensate for deflection of the hull in way of the boiler supports. To accommodate the changing length of the water drum as it expands or contracts with temperature changes. To allow for unequal expansion between the wrapper and tube sheets. D Which area shown in the illustration will offer the most resistance to heat transfer from the fireside to the waterside of a boiler tube? Illustration SG- D E C B C Under what operating conditions may water wall header drains be used for blow down? When it is necessary for rapid drainage of the boiler. During periods of carryover in the steam drum. Only if the fires are secured and no steam is being generated. When the water level is out of sight in the gage glass. C In the boiler shown in the illustration, the arrow "E" indicates a __________. Illustration SG- support tube recirculating tube downcomer water wall tube A One advantage of installing water wall tubes in a boiler furnace is to __________. decrease refractory maintenance reduce combustion rates increase furnace size reduce furnace temperature A In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because __________. they require more water flow since they are exposed to the greatest heat they must screen the superheater from the direct radiant heat of the burners they must act as downcomers to ensure proper circulation their main function is to retard combustion gas flow for maximum heat transfer rates D The boiler superheater shown in the illustration is a/an __________. Illustration SG- overdeck convection-type overdeck integral-type horizontal U-type vertical U-type D Where is the superheater located in the boiler shown in the illustration? Illustration SG- I J H G B The purpose of the division plates installed in boiler superheater headers is to __________. limit the maximum temperature rise of the superheater outlet to 15°F ensure proper steam flow, thus preventing 'short circuiting' of superheater loops provide a means of controlling steam passage in response to throttle demands All of the above. D Which of the devices listed is shown in the boiler illustration? Illustration SG- Regenerative air heater Separately fired superheater Retractable soot blower Integral or interdeck superheater A The items labeled "D" and "M" as indicated on the illustration are commonly called __________. Illustration SG- mica sheets glass inserts cork gaskets face plates B The device shown in the illustration is a/an __________. Illustration SG- deaerator desuperheater eductor air ejector C Desuperheated steam can be found at the __________. main steam stop generator steam stop spray attemperator outlet high pressure turbine steam chest C Which of the following locations could desuperheated steam be considered to occur? Spray attemperator Main engine extractions Both "A" and "B" Neither "A" nor "B" A The primary purpose of a control desuperheater installed in the steam drum of a boiler is to __________. regulate the superheater outlet temperature by cooling a portion of the superheated steam regulate saturated steam temperature through the desuperheater regulate the temperature of superheated steam by adding moisture assure a constant volume of steam flow through the entire superheater under all load conditions A Which of the devices listed is indicated by arrow "H" shown in the illustration? Illustration SG- Economizer Steam soot blowers Overdeck superheater Air heater B The minimum feedwater inlet temperature to a boiler economizer is determined by the __________. radiant heat transfer in the furnace dew point temperature of the stack gas superheater outlet temperature surface area of the third stage heater C Boiler fuel savings gained by the use of an economizer can amount to __________. one half percent for each 15°F rise in feed water temperature three percent for each 5°F rise in feed water temperature one percent for each 10°F rise in feed water temperature three percent for each 20°F rise in feed water temperature D Which of the conditions listed could cause steam formation in the economizer? Soot buildup on the gill rings. An open main feed pump recirculating line. Excessive water flow rates. Sudden large increase in the firing rate. D The boiler economizer provides additional heat to the __________. steam leaving the superheater air supply entering the furnace fuel oil entering the furnace feed water entering the boiler A A check valve is located between the economizer and the steam drum to __________. prevent steam and water flow reversal from the drum should an economizer casualty occur assure a positive feed water flow to the steam drum prevent the feed pump from becoming vapor bound assure a positive feed water flow through the economizer B One factor for determining the minimum feedwater inlet temperature to a boiler economizer is the __________. superheater inlet temperature dew point temperature of the stack gases temperature of steam bled off the LP turbine desuperheater outlet temperature D Which of the listed refractory materials can be used in an area directly exposed to the highest heat in the furnace? Baffle mix Insulating block Insulating brick Firebrick A In a regenerative air heater, air is bypassed around the heater while __________. operating at low steaming rates giving a surface blow blowing tubes crossing over forced draft fans C When heated, brickwork in a boiler is kept from buckling by the installation of __________. insulating bricks insulating blocks expansion joints sliding saddles A Which of the listed refractory materials is composed of wool fibers and clay binders? Insulating cement Castable fireclay Chrome castable ore All of the above. D According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating block"? Illustration SG- 3 1 2 7 A Boiler refractory firebrick is secured to the casing by __________. slots in the brick engaging anchor bolts fast drying plastic refractory mortar high strength tensile fasteners studding on the water wall tubes D Boiler refractory previously baked out and fired is most sensitive to __________. radiant heat of the burner rapid heating sustained high furnace temperature rapid cooling A Which of the listed types of safety valves is shown in the illustration? Illustration SG- Huddling chamber type Pressure-loaded type Jet flow type Nozzle reaction type C On a boiler safety valve, the blowdown adjusting ring is locked in place by a __________. wire seal locknut set screw cotter pin A What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve? The principle by which blow down is accomplished. The manner in which lifting pressure is adjusted. The difference in valve relieving capacities. The manner in which steam pressure causes initial valve opening. A When excessive static boiler pressure has resulted in the initial lift of the valve disc, a huddling chamber safety valve will continue to lift open as a result of ___________, steam pressure acting on the enlarged area of projecting lip or ring the resulting reactive force created by the rapid expansion of escaping steam an increase in steam velocity through an adjustable orifice ring steam pressure transmitted through a pipe connected to the superheater outlet A Scavenging air lines are connected to boiler stack periscopes to __________. prevent stack gases from contaminating the periscopes internal components maintain a negative pressure in the periscope line keep the mirrors from misaligning keep the periscope tubing from warping D Which type of waterside deposits can normally be removed by chemically boiling out a boiler? Sludge High temperature oxide Corrosion deposits Oil D Steam line water hammer can be best prevented by __________. always opening steam valves rapidly replacing all 90°Elbows with capped tees keeping steam temperature below the saturation point keeping lines drained and insulated C A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should __________. drain and refill the boiler when the pH goes above 6 drain and refill the boiler each week completely fill the boiler with deaerated feed water and maintain a slight pressure completely fill the boiler with water, then blow down to steaming level B Which of the methods listed would be most effective in repairing a steam cut on a seating surface of a superheater handhole plate? Filling the cut with iron cement or plastic steel. Filling the cut by welding and then grinding it smooth. Refacing the surface and over torquing the handhole plate. Grinding the seating surface and installing an oversized gasket. B Which of the tools listed is used to remove a boiler tube from a header? Swaging tool Backing out tool Laminating tool Expanding tool A When you are installing a new furnace floor in an oil fired boiler, the clearance between the firebricks should be large enough to __________. allow for expansion without subjecting the joint to flame penetration facilitate rebricking at required maintenance intervals allow for installation of plastic chrome ore after drying allow for proper filling with slag under normal operating conditions A Which of the listed procedures is the most important factor to take into consideration when making repairs to the refractory surrounding the burner openings? Design refractory cone angle must be maintained. All cracks must be completely filled. Plastic firebrick must be used. Finished repair surfaces must be smooth. C A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is __________. spalled and must be replaced normal and need only be cleaned loose and should be repaired cracked and must be patched B Which of the listed refractory materials should be used for patching a burner front formed of plastic, castable, or tile? Air-setting mortar Plastic fireclay Chrome castable insulation Plastic chrome insulation D After patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to __________. allow for expansion prevent slag buildup prevent spalling vent escaping moisture C To assure a long service life for boiler refractory materials after installation, the most effective method is to __________. patch refractory with plastic chrome ore properly secure refractory with anchor bolts avoid rapid temperature changes and follow recommended operating procedures maintain a high furnace temperature at all times A When installed, the economizer relief valve should always be set __________. 50 pounds higher than the drum safety valve plus the water pressure drop through the economizer 50 pounds higher than the superheater safety valve plus the water pressure drop through the economizer at the same pressure as the superheater safety valve at the same pressure as the drum safety valve D When water washing a boiler, the proper sequence for washing the sections should be the __________. generating tubes, superheater, and then economizer screen tubes, generating tubes, and then superheater superheater, economizer, and then generating tubes economizer, superheater, generating, and then screen tubes D Which of the listed mediums should be used when water washing a boiler? Cold freshwater Cold saltwater Heated saltwater Heated freshwater B According to the data given in the illustration, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 126.08 degrees Fahrenheit? Illustration SG- Superheated vapor. Sub cooled liquid. Mixture of saturated liquid and vapor. Saturated liquid. B If the saturation pressure of water is increased, the relative values shown on the illustrated graph of SG- will change. According to pertinent information found in the steam tables of SG-, this will result in __________. Illustration SG- Illustration SG- no change to the length of line 4 a decrease the length of line 4 no change in the height of line 4 a decrease in the height of line 4 B Which of the following statements is true concerning the information tabulated in the table? Illustration SG- At 185.3 psig (.4 kPa), the saturation temperature of a mixture of water and steam is 377.51°F (192°C). When one pound of water changes to one pound of steam at 200 psia (.8 kPa), its volume increases 124.41 times. If one pound of steam at 250 psia (.5 kPa) condenses to one pound of water it will give up 843 BTU's (889.4 kJ) while changing state. All of the above. D According to the data given in illustration, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees Fahrenheit? Illustration SG- Mixture of saturated liquid and vapor. Sub cooled liquid. Saturated liquid. Superheated vapor. A If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F? Illustration SG- 983.4 Btu/lb 582.7 Btu/lb 30.5 Btu/lb 116.5 Btu/lb C What physical changes will occur to the steam within a boiler that has been properly bottled up when additional heat is applied? The pressure will increase and the volume will remain constant. The steam pressure and it specific volume will remain constant. The pressure will increase and the specific volume will decrease. The pressure will remain constant and the specific volume will increase. C The major heat loss in an oil fired boiler is the heat __________. required to change water into steam passing through the boiler casing going up the stack used in the economizer and air heater A A lower than normal boiler stack gas temperature usually indicates __________. incomplete combustion dirty watersides dirty firesides fuel high sulfur content D A high carbon monoxide content in the flue gases of a boiler indicates __________. complete combustion a high carbon content fuel too much excess air incomplete combustion A When the rate of heat transfer through tube walls is so reduced that the metal becomes overheated, which of the following conditions will result in the boiler? Fireside burning Fireside thinning Steam gouging Steam binding A Cratering and water tracking in boiler tubes is caused by __________. water trapped between tubes and refractory burning a fuel with a high vanadium content soot corrosion baked on slag deposits D The formation of a pit in the surface of a boiler tube is most likely to occur when __________. dissolved minerals are present waterside deposits are present sludge is present the tube metal acts as an anode C In a water-tube boiler, waterside scale formation is caused by __________. sodium hydroxide sodium phosphate calcium sulfate magnesium phosphate B Blisters developing on boiler tubes can be caused by __________. hot feed water waterside scale deposits cold feed water air in the feed water A Waterside abrasion of boiler tubes can be caused by __________. mechanical tube cleaning oxygen corrosion improper bends in the tubes entrained impurities in the boiler water C Fireside burning of boiler tubes is usually the direct result of __________. gas laning in tube banks oxygen corrosion of metallic surfaces overheating due to poor heat transfer high furnace temperatures D Boiler tube failures can result from __________. corrosion overheating mechanical stress All of the above. B Warping of superheater screen tubes can be caused by __________. high superheater temperatures sudden cooling of tubes after being overheated high furnace temperatures installing baffles of excessive length C An excessively high superheater temperature could be the result of __________. soot accumulation on the superheater high feed water temperature excessive air excessive steam demand D When operating under constant load, the superheated steam temperature may rise above normal if the __________. excess air is too low feed water temperature is too high boiler is priming feed water temperature is too low A Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a __________. decrease in combustion gas velocity through the superheater badly fouled economizer decrease in steam velocity through the superheater drop in the feed water temperature C Insufficient combustion air supply to the furnace would cause __________. high feed water consumption high stack temperature low superheater outlet temperature the fires to sputter A Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because __________. the boiler must be over fired to maintain the required rate of steam generation the screen tubes absorb excessive heat and transfer the increased temperature to the superheater the temperature of the gas leaving the generating banks will be lower than normal gas laning will result causing overheating of the superheater B Which of the following would indicate a moderate leak in the desuperheater? Higher than normal auxiliary steam pressure Lower than normal auxiliary steam temperature Higher than normal fuel oil consumption Lower than normal fuel oil consumption C Which of the conditions listed could cause a boiler economizer to leak? High stack gas temperatures. High feed water temperatures. Water hammer. Low feed water pressure. B Which of the conditions listed would indicate excessive soot buildup on the economizer? High feed water temperature entering the boiler High superheater temperature Lower than usual air pressure in the furnace Low air temperature entering the boiler C Slag buildup on boiler furnace refractory is undesirable because it causes __________. shrinking of the brickwork excessive cooling of the brickwork peeling or spalling of the brickwork fracturing of the anchor bolts A Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall? The furnace brickwork has collapsed in that area. The insulation block has become slagged. The corbels have failed. The brickwork has become slagged. D Which of the following problems can occur when an excessive number of water screen tubes are plugged? Steam temperature in the drum will decrease. Superheater outlet pressure will rise. Steam pressure leaving the drum will increase. Superheater outlet temperature will rise. D Which of the conditions listed occurs when glassy slag, formed by the burning of fuel oil contaminated with salt water, melts and runs over the furnace wall? Formation of a protective coating. Cracks through the furnace floor. Increased furnace temperature. Damage to the furnace refractory. A Excessive foaming in a steaming boiler can cause damage to the __________. superheater internal feed pipe desuperheater economizer A In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by __________. high solids content and foaming in the drum ruptured feed water control valve diaphragm high feed water temperature low feed water temperature C Rapid fluctuation in the superheater temperature of a steady steaming boiler indicates __________. improper positioning of superheater fires leaky superheater tubes moisture carryover leaky desuperheater tubes A Oil accumulation in boiler water would __________. cause foaming and carryover from the boiler prevent acid attack on the boiler tubes practically eliminate boiler sludge formation increase the heat transfer rate C High boiler water level can cause carryover and __________. warped screen tubes warped water wall tubes damage to the superheater tubes damage to the economizer A Which of the precautions listed should be taken when gagging a boiler safety valve? Tighten the gag only finger tight to prevent damage to the valve stem, disc or seat. Tighten the gag only with the special wrench supplied with the gag. Do not allow the gag to contact the safety valve stem. Ensure that all moving parts of the safety valve are free to move before installing the gag. C Which of the listed operating practices is considered as safe, and should be followed when opening and inspecting the waterside of a boiler? Ventilate the waterside until completely dry. Open the water drum manhole before opening the steam drum manhole. Wire all valves closed that connect to other boilers. Remove handhole plate dogs with a slugging wrench. D If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape? Escape through another compartment on a higher level. Escape by way of a fire room ladder to the outer deck. Use fire room elevator to an upper deck. Escape through another compartment on a lower level. B While underway, the boiler water level in a steaming boiler begins dropping rapidly and cannot be kept at the normal level by standard practices. The engineer's next action should be to __________. blow down the gage glass to find the true water level secure the fires and then secure the main feed stop/check valve to the boiler continue to speed up the feed pump to raise the water level secure the steam stop and then secure the fires B Which of the casualties listed is apt to occur immediately after a high water casualty? Excessive steam pressure Water carryover to the turbines Excessive superheater temperature Massive tube failure B Which action should be taken if the water level in the boiler gage glass drops out of sight and the burners fail to secure automatically? Repair the feed water regulator. Trip the master solenoid. Blow down the gage glass. Increase the feed pump speed. C Which of the following actions should be carried out if the boiler water level is falling due to a tube failure? Start the standby feed pump and feed the boiler using two feed pumps. Open the auxiliary feed stop and check for extra feed. Secure the fires and try to maintain the water level. Speed up the feed pump to keep the water level up while firing the boiler. D If a major flareback occurs to a boiler, which of the following actions should be immediately taken? Purge the fuel oil system. Secure all fire room ventilation. Secure the forced draft fan. Secure the fuel to the burners. A Under EMERGENCY operating conditions, the proper valve positions for controlling feedwater to the boiler should be the __________. auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow auxiliary stop and stop-check valves fully open and the feed pump speed used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feed water regulator auxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow A In the event of a failure of the pneumatic control system, a multi-element feedwater regulator is designed to operate as a __________. manually controlled feed water regulator constant-pressure regulator thermo-hydraulic feed water regulator constant-volume feed water regulator A One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to __________. secure the feed water supply to the boiler close the main steam stop secure the forced draft fans stop the fuel oil service pump C The phrase 'boiler water column' as defined in the regulations, refers to the __________. pressure gauge reading in feet of water pressure head to the feed water pump suction water level indicator vertical water leg D When two or more boilers provide steam flow to a common main steam line, each boiler main steam line shall be fitted with a main steam stop valve and a/an. auxiliary steam stop valve gate valve swing check valve stop-check valve B When preparing to hydrostatically test water-tube boilers, you should __________. remove all inspection plates and manhole covers as required by the marine inspector fill the boiler with water not less than 70°F (21.1°C), nor more than 160°F (71.1°C) make arrangements for simultaneously testing main and auxiliary steam stops with water and steam pressure have the boiler warmed to a temperature not exceeding 100°F (37.8°C) B Which of the following statements is true concerning boiler inspections? At the first inspection for certification after a water-tube boiler has been installed for ten years, it shall be gauged by drilling to determine the actual extent of deterioration. The marine inspector may require any boiler to be drilled to determine its actual thickness any time its safety is in doubt. If the thickness found as a result of gauging is less than original thickness, the boiler must be condemned. Any user of a nondestructive testing device must demonstrate that results with an accuracy of plus or minus one percent are consistently obtainable. C According to 46 CFR Part 61, which of the following statements is true concerning the inspection of water-tube boilers? Boiler mountings attached to boiler nozzles must be opened and removed for examination every 8 years. All mountings shall be opened up and examined by a Coast Guard inspector at eight year intervals after the initial inspection. Boiler mountings attached directly to the boiler plating by screwed studs and nuts shall be removed and examined every 10 years. All boiler mounting studs or bolts shall be removed for examination by a Coast Guard inspector every 4 years after initial inspection. A Which of the following statements represents the Coast Guard Regulation regarding a boiler installation in which the superheater outlet temperature exceeds 850°F? Visible and audible alarms indicating excessive superheat shall be provided. A device, actuated by inlet static pressure and designed to function by the bursting of a pressure retaining disk, must be fitted at the outlet of the superheater. All mountings, fittings, valves, or other superheater attachments must be of malleable cast iron. Safety valves are to be set at 110% of the highest setting of the safety valves on the drum. A Which of the Coast Guard publications listed contain the information regarding allowable repairs to boilers installed on cargo vessels? Marine Engineering Regulations Rules and Regulations for Cargo and Miscellaneous Vessels Modern Marine Engineer's Manual Manufacturer's Instruction Manual D According to Coast Guard Regulations (46 CFR), which of the following is classified as a boiler mounting? Main feed check valve Soot blower element Escape piping drain valve Blow-off valve B Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is __________. 300 psig ( kPa) or over 350 psig ( kPa) or over 500 psig ( kPa) or over 550 psig ( kPa) or over D Coast Guard Regulations (46 CFR Part 5 permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of. 350 psi and 460°F 350 psi and 406°F 250 psi and 460°F 250 psi and 406°F D Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that __________. the hydrostatic test pressure must be maintained on the piping for a minimum of one hour a pipe with a nominal size of six inches or more is not required to be hydrostatically tested not less than fifty percent of the lagging shall be removed each time the hydrostatic test is applied the hydrostatic test shall be applied from the boiler drum to the throttle valve B According to Coast Guard Regulations (46 CFR), which of the following steam piping conditions, subjected to main boiler pressure, is exempted from hydrostatic testing? All piping to the ship's service generators. All piping with a nominal size of 3 inches or less. All piping from the main steam stop to the throttle valve. All piping equipped with a safety or relief valve. A If the maximum steam generating capacity of a boiler is increased Coast Guard Regulations (46 CFR) require that the safety valve's __________. relieving capacity be checked reseating pressure be increased blow down be reduced lifting pressure be increased D Coast Guard Regulations (46 CFR) permit repairs and adjustments to boiler safety valves while installed on a main propulsion boiler and may be made by __________. any competent person on the ship only the safety valve manufacturer an approved repair facility only the chief engineer in an emergency C Coast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure? 0 (%) 25 (%) 75 (%) 90 (%) B Coast Guard Regulations (46 CFR) require that the final setting of boiler safety valves be conducted in presence of the __________. COTP marine inspector chief engineer OCMI B The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be. 825 psi 850 psi 875 psi 900 psi D A boiler superheater safety valve is set to lift at 450 psi ( kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of __________. 450 psi ( kPa) 455 psi ( kPa) 460 psi ( kPa) 465 psi ( kPa) D The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches. The term 'nominal size' refers to the free spring length diameter of the feather diameter of the huddling chamber diameter of the inlet opening B Coast Guard Regulations (46 CFR) concerning superheater safety valves require that the valve. is not set at a pressure less than the feed pump relief valve nominal size is not less than 1.5 inches nor more than 4 inches be set at a pressure higher than the drum safety valves can only be operated by a pilot valve B Coast Guard Regulations (46 CFR) concerning marine boilers, require the installation of a safety valve on the __________. preheated steam outlet superheated steam outlet desuperheated steam outlet auxiliary steam outlet B Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked __________. when repairs have been made to the safety valves when the generating capacity of the boiler is increased at least once every 4 years at least once a year B Coast Guard Regulations (46 CFR) require the duplex fuel oil discharge strainers installed in boiler fuel oil service systems to be __________. enclosed in a drip-proof vented enclosure to reduce the possibility of fire located so as to preclude the possibility of spraying oil on the burner or boiler casing as close to the fuel oil service manifold as practicable a positive venting system that will return any vapors to the pump suction D Coast Guard Regulations (46 CFR Part 5 require that new fuel oil service piping between pumps and burners be subjected to __________. a hydrostatic leak test to the design pressure specified by the Coast Guard a hydrostatic test of 1.25 times the maximum allowable pressure with the relief valves closed spot radiographic examination of portions of the finished weld joints a hydrostatic test of 1.5 times the maximum allowable pressure but not less than 500 psi ( kPa) A Coast Guard Regulations (46 CFR) require that quick-closing valves on a fuel oil service system should be installed as close as is practicable to the __________. boiler front fuel oil header fuel oil settling tanks fuel oil service heaters suction side of the fuel oil pump D In accordance with Coast Guard Regulations (46 CFR) all fuel oil service piping in the vicinity of the burners must __________. utilize leak proof gaskets in all joints have all joints seal welded be provided with coamings or drip pans have wrap around deflectors on all bolted flanged joints B Coast Guard Regulations (46 CFR) for boiler fuel oil service systems require __________. all piping between service pumps and burner fronts to be located below the floor plates to eliminate fire hazards machinery driving fuel oil service pumps to be fitted with remote controls so that they may be stopped in the event of a fire fuel oil service tanks to overhang boilers to utilize heat radiated from the boilers for greater efficiency fuel oil heaters for boilers burning fuels with low viscosity A According to Coast Guard Regulations (46 CFR), which of the following is permitted in boiler fuel oil service system discharge piping? Screwed bonnet valves of the union bonnet type. Pipe unions one inch or greater in diameter. Street ells made of carbon steel. Bushings made of seamless steel. B Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to __________. the feed pump shut off head pressure 110% of the drum safety valves highest set pressure 125% of the boiler hydrostatic test pressure 150% of the boiler design test pressure C When a boiler economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR) require which of the following devices to be installed? A stop-check valve is to be located at the economizer inlet. An emergency drain line must be provided to the reserve feed tank. A stop-check valve is to be located at the economizer outlet. A sentinel valve is to be fitted on the superheater outlet. C According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of. 250 psig ( kPa) or over 300 psig ( kPa) or over 400 psig ( kPa) or over 600 psig ( kPa) or over D When preparing to hydrostatically test water-tube boilers, you should __________. remove all inspection plates and manhole covers as required by the marine inspector make arrangements for simultaneously testing main and auxiliary steam stops with water and steam pressure have the boiler warmed to a temperature not exceeding 100°F (37.8°C) fill the boiler with water not less than 70°F (21.1°C), nor more than 160°F (71.1°C) B Which of the following statements is true concerning boiler inspections? If the thickness found as a result of gauging is less than original thickness, the boiler must be condemned. The marine inspector may require any boiler to be drilled to determine its actual thickness any time its safety is in doubt. At the first inspection for certification after a water-tube boiler has been installed for ten years, it shall be gauged by drilling to determine the actual extent of deterioration. Any user of a nondestructive testing device must demonstrate that results with an accuracy of plus or minus one percent are consistently obtainable. C According to 46 CFR Part 61, which of the following statements is true concerning the inspection of water-tube boilers? All boiler mounting studs or bolts shall be removed for examination by a Coast Guard inspector every 4 years after initial inspection.

o Boiler mountings attached to boiler nozzles must be opened and removed for examination every 8 years. Boiler mountings attached directly to the boiler plating by screwed studs and nuts shall be removed and examined every 10 years. All mountings shall be opened up and examined by a Coast Guard inspector at eight year intervals after the initial inspection. B Which of the following statements represents the Coast Guard Regulation regarding a boiler installation in which the superheater outlet temperature exceeds 850°F? All mountings, fittings, valves, or other superheater attachments must be of malleable cast

iron. Visible and audible alarms indicating excessive superheat shall be provided. Safety valves are to be set at 110% of the highest setting of the safety valves on the drum. A device, actuated by inlet static pressure and designed to function by the bursting of a pressure retaining disk, must be fitted at the outlet of the superheater. A Which of the Coast Guard publications listed contain the information regarding allowable repairs to boilers installed on cargo vessels? Marine Engineering Regulations Rules and Regulations for Cargo and Miscellaneous Vessels Manufacturer's Instruction Manual Modern Marine Engineer's Manual C According to Coast Guard Regulations (46 CFR), which of the following is classified as a boiler mounting? Escape piping drain valve Main feed check valve Blow off valve Soot blower element D Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is __________. 300 psig ( kPa) or over 550 psig ( kPa) or over 500 psig ( kPa) or over 350 psig ( kPa) or over C Coast Guard Regulations (46 CFR Part 56) permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of __________. 350 psi and 460°F 350 psi and 406°F 250 psi and 406°F 250 psi and 460°F A Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that __________. the hydrostatic test shall be applied from the boiler drum to the throttle valve the hydrostatic test pressure must be maintained on the piping for a minimum of one hour not less than fifty percent of the lagging shall be removed each time the hydrostatic test is applied a pipe with a nominal size of six inches or more is not required to be hydrostatically tested B According to Coast Guard Regulations (46 CFR), which of the following steam piping conditions, subjected to main boiler pressure, is exempted from hydrostatic testing? All piping equipped with a safety or relief valve. All piping with a nominal size of 3 inches or less. All piping to the ship's service generators. All piping from the main steam stop to the throttle valve. C If the maximum steam generating capacity of a boiler is increased Coast Guard Regulations (46 CFR) require that the safety valve's __________. lifting pressure be increased blow down be reduced relieving capacity be checked reseating pressure be increased A Coast Guard Regulations (46 CFR) permit repairs and adjustments to boiler safety valves while installed on a main propulsion boiler and may be made by __________. the chief engineer in an emergency any competent person on the ship only the safety valve manufacturer an approved repair facility only C Coast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure? 0 (%) 90 (%) 75 (%) 25 (%) D Coast Guard Regulations (46 CFR) require that the final setting of boiler safety valves be conducted in presence of the __________. Chief Engineer OCMI COTP Marine Inspector C The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be __________. 875 psi 900 psi 850 psi 825 psi C A boiler superheater safety valve is set to lift at 450 psi ( kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of __________. 450 psi ( kPa) 455 psi ( kPa) 465 psi ( kPa) 460 psi ( kPa) B The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches. The term 'nominal size' refers to the __________. free spring length diameter of the inlet opening diameter of the huddling chamber diameter of the feather C Coast Guard Regulations (46 CFR) concerning superheater safety valves require that the valve __________. is not set at a pressure less than the feed pump relief valve can only be operated by a pilot valve nominal size is not less than 1.5 inches nor more than 4 inches be set at a pressure higher than the drum safety valves A Coast Guard Regulations (46 CFR) concerning marine boilers, require the installation of a safety valve on the __________. superheated steam outlet desuperheated steam outlet preheated steam outlet auxiliary steam outlet D Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked __________. at least once every 4 years at least once a year when repairs have been made to the safety valves when the generating capacity of the boiler is increased D Coast Guard Regulations (46 CFR) require the duplex fuel oil discharge strainers installed in boiler fuel oil service systems to be __________. as close to the fuel oil service manifold as practicable enclosed in a drip-proof vented enclosure to reduce the possibility of fire a positive venting system that will return any vapors to the pump suction located so as to preclude the possibility of spraying oil on the burner or boiler casing C Coast Guard Regulations (46 CFR Part 56) require that new fuel oil service piping between pumps and burners be subjected to __________. spot radiographic examination of portions of the finished weld joints

o a hydrostatic leak test to the design pressure specified by the Coast Guard a hydrostatic test of 1.5 times the maximum allowable pressure but not less than 500 psi ( kPa) a hydrostatic test of 1.25 times the maximum allowable pressure with the relief valves closed B Coast Guard Regulations (46 CFR) require that quick-closing valves on a fuel oil service system should be installed as close as is practicable to the __________. fuel oil settling tanks boiler front fuel oil header suction side of the fuel oil pump fuel oil service heaters A In accordance with Coast Guard Regulations (46 CFR) all fuel oil service piping in the vicinity of the burners must __________. have wrap around deflectors on all bolted flanged joints have all joints seal welded utilize leak proof gaskets in all joints be provided with coamings or drip pans B Coast Guard Regulations (46 CFR) for boiler fuel oil service systems require __________. fuel oil service tanks to overhang boilers to utilize heat radiated from the boilers for greater efficiency machinery driving fuel oil service pumps to be fitted with remote controls so that they may be stopped in the event of a fire fuel oil heaters for boilers burning fuels with low viscosity all piping between service pumps and burner fronts to be located below the floor plates to eliminate fire hazards D According to Coast Guard Regulations (46 CFR), which of the following is permitted in boiler fuel oil service system discharge piping? Pipe unions one inch or greater in diameter. Street ells made of carbon steel. Bushings made of seamless steel. Screwed bonnet valves of the union bonnet type. B All oil-fired main propulsion burners with automatic safety control systems must automatically close the burner valve when __________. the burner is properly seated actuated by a boiler safety trip starting "trial for ignition" the flame in boiler furnace is confirmed C Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to __________. 125% of the boiler hydrostatic test pressure 150% of the boiler design test pressure 110% of the drum safety valves highest set pressure the feed pump shut off head pressure A When a boiler economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR) require which of the following devices to be installed? A stop check valve is to be located at the economizer outlet. A sentinel valve is to be fitted on the superheater outlet. A stop check valve is to be located at the economizer inlet. An emergency drain line must be provided to the reserve feed tank. A According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of __________. 400 psig ( kPa) or over 250 psig ( kPa) or over 600 psig ( kPa) or over 300 psig ( kPa) or over C If a quantity of saturated steam consists of 90 percent steam and 10 percent moisture, the quality of the mixture is __________. 10 (%) 80 (%) 90 (%) 100 (%) D If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F? Illustration SG- 30.5 Btu/lb 116.5 Btu/lb 582.7 Btu/lb 983.4 Btu/lb C The best conductor of heat in a marine boiler is __________. water brick steel steam C At a given pressure, erosion of steam piping and machinery will be minimized by utilizing __________. saturated steam desuperheated vapor superheated steam wet steam C Which type of energy conversion is associated with an operating steam boiler? Mechanical Specific Thermal Kinetic C Most marine boilers are designed to produce __________. saturated steam only superheated steam only saturated and superheated steam superheated and supercritical steam C Which of the following statements describes the effects that dissolved oxygen has on boiler internal surfaces with changes in temperature and pressure? It increases the corrosive effect with lowered pressure and increases its corrosive effect with increased temperature. It decreases the corrosive effect when both pressure and temperature are increased. It increases the corrosive effect with increased pressure and decreases its corrosive effect with increased temperature. Temperature and pressure have no effect on the corrosive effect of dissolved oxygen. A Which of the stated pressure conditions identifies the boiler design pressure? The pressure specified by the manufacturer as a criterion for boiler design. The pressure at which a boiler is operated during overload conditions. The same pressure as the boiler operating pressure at full power capacity. A pressure lower than boiler operating pressure. B Which of the following conditions must exist before the superheating of saturated steam can occur in a steam propulsion boiler? The firing rate of the boiler must be increased. The steam must be directed to an area separate from the steam drum. The flow of feed water to the boiler must be increased. The economizer must be on line. B The greatest deterrent to heat transfer from the fireside to the waterside of a boiler is __________. water film gas film water eddies gas eddies C With an increase in the saturation pressure of a fluid, the value represented by line "5" on the graph will __________. Illustration SG- increase the number of BTU's per pound, per change in degree of temperature decrease the number of BTU's per pound, per change in degree of temperature remain virtually the same represent an increase in the latent heat of condensation C With reference to the chart, if a boiler generates saturated steam at 385.3 psig, how much heat per pound was required to change the water into steam if the feed water temperature was initially 104.5°C? Illustration SG- 96.85 BTU 97.15 BTU .40 BTU .45 BTU C According to the data given in illustration, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees Fahrenheit? Illustration SG- Sub cooled liquid. Saturated liquid. Superheated vapor. Mixture of saturated liquid and vapor. C According to the data given in the illustration, which of the following would be the physical state of the fluid at a gage vacuum of 29.00 inches Hg, and 85.21 degrees Fahrenheit? Illustration SG- Sub cooled liquid. Saturated liquid. Superheated vapor. Mixture of saturated liquid and vapor. D Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant. When there is an increase in the temperature of the steam and water in the boiler, which of the following effects will occur on the pressure and the specific volume of the steam? The steam pressure and volume will remain constant. The pressure will increase and the volume will remain constant. The pressure will remain constant and the volume will increase. The pressure will increase and the specific volume will decrease. A Steam tables can be used to obtain the __________. values for properties of water and steam vapor at various conditions mechanical efficiency of the main unit steam generating capacity of a vessel's boilers specific fuel consumption under steady steaming conditions C From which of the areas listed are condensate drains normally collected and returned to the low-pressure drain system? Steam systems operating in excess of 150 psi Steam whistle separator/trap Main and auxiliary air ejector after condensers Each main feed pump steam supply line C A basic comparison can be made between a low pressure evaporator operation and a main condenser with regards to the removal of non-condensable gases. The vacuum drag line for the main condenser is specifically connected in which area? hot well steam lane air cooler section main tube bank A Which of the listed systems would be a potential source for the high pressure drain system? Steam systems operating in excess of 150 psi Galley steam tables Laundry steam pressing machines Fuel oil tank heating coils

Understanding the 0.5 Ton Steam Boiler and Its Applications

When considering steam boilers for various industrial applications, one often comes across the 0.5 Ton Steam Boiler. This compact and efficient solution has become increasingly popular among businesses for its unique advantages. Whether you're in manufacturing, food processing, or other sectors, understanding the benefits of a 0.5 Ton Steam Boiler can help you make an informed decision.

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Compact and Efficient Design

One of the primary benefits of a 0.5 Ton Steam Boiler is its compact design. These boilers are specifically engineered to fit into limited spaces without compromising on performance. Their small footprint makes them ideal for facilities that may not have excessive room for larger heating systems.

Moreover, their efficiency enhances performance, allowing businesses to produce steam quickly and economically. For instance, in a small manufacturing unit, a 0.5 Ton Steam Boiler can provide sufficient steam for processes like sterilization or cooking without requiring additional space or resources.

Cost-Effective Operation

Business owners are always looking for ways to reduce operating costs, and a 0.5 Ton Steam Boiler can be a game-changer in this regard. These boilers consume less fuel compared to larger models, translating to lower energy costs—a crucial consideration in today’s eco-conscious market.

Additionally, because of their smaller size, maintenance costs tend to be lower. Routine inspections and repairs are generally less time-consuming and less intensive, which can save both time and money for business operations.

Versatility in Use

Another significant advantage of a 0.5 Ton Steam Boiler is its versatility. These boilers can be utilized in a variety of applications including heating, drying, cleaning, and generating power. This makes them suitable for several industries, such as:

• Food Processing: Steam is essential for cooking and cleaning processes in food manufacturing.
• Textile Industry: Boilers are used for dyeing and fabric finishing.
• Pharmaceuticals: Steam is vital in the sterilization processes.

Because of this versatility, investing in a 0.5 Ton Steam Boiler can provide long-term benefits and adaptability to changing business needs.

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Environmental Benefits

In an age increasingly focused on sustainability, the 0.5 Ton Steam Boiler stands out for its lower emissions. Many modern designs are equipped with advanced combustion technologies that reduce greenhouse gases and pollutants. This not only helps businesses comply with environmental regulations but also enhances their corporate responsibility image.

For businesses aiming to reduce their carbon footprint, choosing a 0.5 Ton Steam Boiler can be a step in the right direction. Moreover, using less fuel also means conserving natural resources, which is a win-win for both the business and the planet.

Common Questions About the 0.5 Ton Steam Boiler

What industries commonly use a 0.5 Ton Steam Boiler?
As mentioned, industries such as food processing, textiles, and pharmaceuticals frequently utilize 0.5 Ton Steam Boilers due to their diverse applications and efficiency.

How much steam can a 0.5 Ton Steam Boiler produce?
A 0.5 Ton Steam Boiler can produce roughly 500 kg of steam per hour. This capacity is typically adequate for smaller manufacturers and can be scaled up with multiple units if needed.

Are there specific maintenance requirements for these boilers?
Yes, while 0.5 Ton Steam Boilers are easier to maintain, regular checks on safety valves, water levels, and system pressure are still essential. Scheduled servicing by certified professionals can help keep your boiler in top shape and extend its life.

Where can I find a reliable supplier of 0.5 Ton Steam Boilers?
It's recommended to do thorough research and read customer reviews before selecting a supplier. Look for companies that offer warranties and have a good reputation in the industry for customer service and technical support.

Conclusion

The 0.5 Ton Steam Boiler stands out as an optimal choice for many businesses seeking a compact, cost-effective, and versatile steam generating solution. Its numerous benefits, ranging from increased efficiency to environmental advantages, make it an essential element of modern industrial practices. By considering your specific needs and consulting with experts, you can effectively leverage the significant advantages offered by a 0.5 Ton Steam Boiler in your operations.

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