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3rd class stationary steam engineer license prep exam, Exams of Engineering

3rd class stationary steam engineer license prep exam

Typology: Exams

2024/2025

Available from 01/21/2025

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3rd class stationary steam engineer

license prep exam

_________ are necessary for complete combustion - Answer- time, temperature, mixture, and atomization if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ - Answer- 214. a boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and closes at 398 PSI. The blowdown is______psi - Answer- 12 an oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-generator - Answer- steam turbine a boiler is producing 40,000lb of steam/hr at a pressure of 100 PSI and a steam temperature of 500 degrees Fahrenheit. The steam produced is _______ steam - Answer- superheated the economizer on a boiler is used to _______ - Answer- add heat to the feed water blowers are normally used with________ boilers - Answer- water tube overheating of tubes on a boiler can be caused by________ - Answer- scale on tubes carbon dioxide in a condensate return system causes_________ - Answer- channeling a ________ pump is a positive displacement pump - Answer- reciprocating a boiler generating 6000 lb of steam/hr produces _______btu/hr - Answer- 6,000, a bottom blowdown is performed on a boiler to _____ - Answer- discharge sludge and sediment water columns are connected to the boiler with a minimum of _______" pipe - Answer- 1 the minimum size of a water column blowdown valve is_______". - Answer- 3/

the maximum size bottom blowdown valve on a boiler is_________". - Answer- 2 1/ a ________ allows condensate to pass through, but stops Steam. - Answer- a steam trap when taking over a shift, the first thing to do is check the________ - Answer- water level in each boiler according to the asme code, a high-pressure boiler having more than 500 square feet of heating surface shall have________ - Answer- two or more safety valves the probable cause of an increase in temperature of gases of combustion at the boiler Outlet is____ - Answer- dirty heating services boilers in battery equipped with________ must have two main steam stop valves and a free-flowing drain between them - Answer- manhole openings in order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer should______ - Answer- blowdown the gauge glass a continuous blowdown line is located___ - Answer- in the Steam and water drum well below the nowl a temperature reading of 80 degrees Celsius is equal to_________°f - Answer- 176 a chimney temperature of 250 degrees Fahrenheit above steam temperature indicates_______ - Answer- poor efficiency a manometer is red in________ - Answer- inches of water the boiling point of water will____ with an increase in pressure - Answer- be raised if a lather is not obtained when performing a soap hardness test, the water sample is_______ - Answer- hard combustion efficiency can be increased when air is________ - Answer- preheated ______ draft is produced by a fan located between the boiler and the chimney - Answer- induced the overspeed trip on a steam turbine should be tested ______ - Answer- before putting the steam turbine on-line a high CO2 reading in the gases of combustion is a sign of____ - Answer- High combustion efficiency

the purpose of chemically treating feedwater is to________ - Answer- turn scale- forming salts to a non adhering sludge water in a d rating feed water heater is prevented from entering the steam line by a(n) _______. - Answer- Loop seal or internal overflow a steam turbine operating at 3600 RPM will trip at_________ rpm - Answer- 3960 he steam line going to The Blowers is connected to the main ________ - Answer- steam drum before using blowers on a boiler,________ - Answer- drain set blower lines an accumulation of snow on the Fireside of a boiler tubes________ - Answer- decreases boiler efficiency a globe valve installed in the feed water line between the feed water pump and boiler has a pressure from the feed water pump_________ the valve disc - Answer- under the range of a pressure gauge should be twice the safety valve setting, but not less than______ time (s) the safety valve setting - Answer- 1 1/ hard scale formed on the inside of tubes is best removed by________ - Answer- air- or water-driven turbines to correct a low water condition,_____ - Answer- secure fires desuperheater drain is used to_______ - Answer- establish steam flow a sudden rise in chimney temperature with no increase in load indicates______ - Answer- there is a broken baffle the btu content of natural gas is_____ - Answer- 100,000 btu/therm the safety valve setting on the Steam and water drum is ________ a superheater safety valve - Answer- higher than the btu content of number 6 fuel oil is approximately - Answer- 18750 BTU / lb chemicals can be added to a boiler by a______pump - Answer- proportioning the feed water stop valve is found between the____ - Answer- boiler and check valve sensible heat is______ - Answer- heat that can be measured with a thermometer

balanced draft is______ - Answer- constant furnace pressure slightly below atmospheric pressure a flame rod_______ - Answer- ensures that the gas pilot is lighted there are approximately_____btu in 1 cu ft of Natural Gas - Answer- 1000 the pH of boiler water may be controlled by using ______ - Answer- caustic soda boiler water with a pH of 11 is________ - Answer- alkaline a scotch Marine boiler is easily identified because it_____ - Answer- has a cylindrical internal furnace the air flow switch at the burner fan housing________ - Answer- and shows the primary air fan is functioning the asme code recommends that low water fuel cutoff switch be tested by an evaporation test__________ - Answer- monthly a neutral solution is_______ on the pH scale - Answer- 7 a dry pipe separator _____ - Answer- delivers higher-quality steam to the header draft is carefully controlled to_____ - Answer- completely burn fuel supplied to the burner draft is measured with a_________ - Answer- manometer a ringelmann test is used to determine_______ - Answer- smoke density a flame scanner proves (verifies) __________ - Answer- pilot in Maine Flame according to the asme code, when warming up a boiler the air cock is closed when_______ - Answer- the steam pressure gauge reads 25 psi a motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity - Answer- 80 a deposit of scale or mud in an HRT boiler could cause_____ - Answer- a bag to develop water wall tubes protect the refractory and_____ - Answer- increase boiler heating surface

steam at E250 psia and 400 degrees Fahrenheit is considered______ Steam - Answer- saturated sensible heat is heat that_____ - Answer- changes a substances temperature but not its state extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______ psi - Answer- 125 to check the water level on a boiler online, it is best to_____ - Answer- blowdown the gauge glass a steam pressure gauge has a siphon between the boiler and the pressure gauge to _______ - Answer- prevent Steam from entering the pressure gauge if a boiler evaporates 50,000 lbs of steam/hour and is evaporating 10 pounds of steam/sq ft of heating surface, the heating surface of the boiler is ____sq ft - Answer- 5000 oxygen in feed water causes ______ - Answer- pitting it is permissible to have one blowdown valve on a boiler operated under______ psi - Answer- 100 at atmospheric pressure, water boils and turns to steam at _____ °f - Answer- 212 a steam pressure gauge is protected against excessive temperature by a ______ - Answer- siphon the only type of safety valve allowed on a boiler by the asme code is a_____ safety valve - Answer- spring-loaded pop the primary function of a boiler is to _____ - Answer- generate steam efficiently if the burner is firing and no water is in the gauge glass, the best procedure to follow is to_______ - Answer- shut down the burner and secure the boiler a high pressure boiler operates at a pressure above______ PSI and 6 BHP - Answer- 15 a safety valve on a boiler pops______ - Answer- between working pressure and mawp in a fire tube boiler, the Heat and gases of combustion pass _________ - Answer- through the tubes

as steam pressure in a boiler increases, there is a corresponding increase in the ______ - Answer- temperature of steam and water the safety valve on a boiler _____ - Answer- prevents the boiler from exceeding its mawp a steam trap ______ - Answer- automatically remove sand and water without loss of steam the amount of excess air in gases of combustion is normally determined by the analysis of______ - Answer- O before lighting off a boiler during a cold startup, the operator must first______ - Answer- check for the correct water level boiler should be warmed up slowly when starting up to ______ - Answer- allow uniform expansion of drums and tubes combustion requires____ - Answer- fuel, oxygen, and Heat the three most common fuels used in boilers are _____ - Answer- gas, fuel oil, and Coal incomplete combustion can be caused by ______ - Answer- insufficient air after replacing a gauge glass but before placing it in service, it is necessary to ______ - Answer- crack open the steam valve in warm the gauge glass two bottom blowdown valves are required on boilers operating at pressures above______ psi - Answer- 100 extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ____ psi - Answer- 125 package boilers are programmed to _____ - Answer- ignite the burner in low fire there are________ sq ft of heating surface in a water tube 3 1/2" in diameter and 20' long - Answer- 18. to change 1 lb of water from and at212 °f into steam at atmospheric pressure,______ btu are necessary - Answer- 970. a surface condenser is one that______ - Answer- has circulating water flowing through the tubes and exhaust steam around the outside of the tubes a boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size feed water pump to supply this boiler is ________ gal./hr. - Answer- 3795

three types of draft used in power plants are______ - Answer- natural, forest, and induced in a water tube boiler, heat and gases of combustion pass______ - Answer- around the tubes when the burner is in high fire, the______ - Answer- air-fuel ratio is at maximum rate a boiler with a draft gauge showing a positive pressure indicates_____ - Answer- furnace pressure is above atmospheric pressure downcomer tubes are found _____ - Answer- in a water tube boiler a boiler connected in battery requires a free blowing drain between the two stop valves when the ______ - Answer- boiler has a manhole opening most furnace explosions are caused by _____ - Answer- failure to purge the furnace at startup baffles in the boiler are designed to direct gases of combustion for close contact with the ________ - Answer- boiler heating surface the overspeed tripping device on a steam turbine must be tripped when____ - Answer- shutting down the steam turbine one gallon of no. 6 fuel oil weighs approximately _______ lb. - Answer- 8. three types of boiler feed water pumps are _____ - Answer- reciprocating, centrifugal, and turbine the most important fitting on a boiler is the______ - Answer- safety valve viscosity of fuel oil is a________ - Answer- measure of internal resistance to flow boiler water treatment is required to____ - Answer- prevent scale formation on eating surfaces the safety valve______ - Answer- prevents the boiler from exceeding its mawp try cocks I used to________ - Answer- as a secondary means to determine water level a glass is used to ______ - Answer- indicate the water level in the boiler before using soap blowers, it is necessary to______ - Answer- open the steam line on the soot blower

safety valve repair should be done by the________ - Answer- safety valve manufacturer or an authorized representative steam at a temperature of 350 degrees Fahrenheit and a pressure of 50 psi is______ - Answer- superheated a duplex double-acting reciprocating feed water pump has____ - Answer- to steam Pistons 2 to 2 2/2 times larger in area than the water piston an accumulation test is used to determine_______ - Answer- safety valve capacity a water tube boiler has 250 tubes that are 20 ft long and 3" in diameter. if the boiler produces one BHP for every 10 sq ft of heating surface, the maximum BHP it will produce is________ BHP - Answer- 392 during a boiler inspection, the main steam stop valves are _______ - Answer- closed, locked, and tagged when a quick opening valve is used as a blowdown valve, it is located ______ - Answer- between the boiler and slow opening valve listing lovers on safety valves are used to_____ - Answer- manually test valves the frequency of performing a bottom blowdown is determined by ______ - Answer- boiler Water Analysis normally a water column and gauge glass should be blown down _____ - Answer- at the start of a shift in whenever and out of the water level a thermostatic trap opens when the____ - Answer- the Bellows contract an economizer located in the path of the gases of combustion increased boiler efficiency approximately 1% for each ___°f rise in feed water temperature - Answer- 10 the purpose of a vent on the open feedwater heater is to _____ - Answer- remove oxygen and non condensable gases steam pressure gauges are calibrated in____ - Answer- pounds per square inch bottom blowdown lines are located______ - Answer- at the lowest part of the water side of the boiler sewer lines are protected from pressure and temperature by the _______ when blowing down a boiler - Answer- blowdown tank

the upper connection to a gauge glasses closed. If the boiler has a normal water level, the level on the gauge glass will show _______ glass - Answer- full combustion controls on a boiler are used to _____ - Answer- control the air fuel ratio ceiling strips that warned of excessive radial tolerance are found on_____ - Answer- steam turbines pre-purge, air to fuel ratio, and post Purge of the burner are functions of the _______ - Answer- combustion controls a water column______ - Answer- reduces fluctuations of water in the gauge glass the low water fuel cutoff can be tested by _____ - Answer- allowing the water level to drop boilers that are equipped with air heaters and economizers usually have_____ draft fans - Answer- forced and induced baffles are used in the Steam and water drum of water tube boilers to _____ - Answer- prevent water carry over with the steam a closed feedwater heater is always installed_______ - Answer- on the discharge side of the feed water pump the purpose of a burner pressure control is to _____ - Answer- start and stop the burner firing cycle a gas pressure regulator is used to control the ______ - Answer- gas pressure at the burner if the chimney temperature is 250 degrees Fahrenheit higher than the Steam and water temperature, the boiler is _______ - Answer- not operating efficiently the most controllable heat loss in a boiler is from the loss of heat in______ - Answer- gases of combustion on the feed water line, the valve closest to the boiler shell is a _____ valve - Answer- stop four basic systems found on boilers are ______< - Answer- steam, feed water, fuel, and draft if a low-water condition occurs, the operator should first _______ - Answer- secure the burners

a pressure control on a boiler is used to. _______ - Answer- control the operating range of the boiler sup blowers are most commonly found ______ - Answer- on water tube boilers a duplex reciprocating feed water pump operates on the principle that the _______ - Answer- steam piston area must be 2 to 2 1/2 times larger than the water piston when testing the safety valve by hand, it is the accepted practice to have. _________ - Answer- at least 75% popping pressure before testing oxygen in a boiler drum causes. ________ - Answer- pitting __________ steam turbines allow condensate to be reclaimed for use in the system - Answer- condensing with water at a temperature of 212°f, 1 bhp is equivalent to the evaporation of 34.5 lb of water every ________ hour(s) - Answer- 1 in a closed feedwater heater, the _________ - Answer- Steam and water do not mix sensible heat is heat that ______ - Answer- changes the temperature of a substance but not its state when performing a hydrostatic test on a boiler, the safety valve must be. ________ - Answer- removed from the boiler and the opening blank or gagged if repairs are to be made on a safety valve, they must be made by the. _______/ - Answer- manufacturer of the safety valve or authorized representative the proper way to stop a steam turbine when taking it off line is to _______ - Answer- trip the over speed device by hand approximately. _______^ of air is required to completely burn 1 lb of fuel oil - Answer- 15 lb in order to reduce the viscosity of a fuel oil, it's. _______ - Answer- temperature must be increased what are is prevented from backing up into the steam line on a deaerator ________ - Answer- an internal overflow or a loop seal a steam pressure gauge must have a range of at least. _______ - Answer- 1 1/2 time's the mawp

electrostatic precipitators are used in the power plants to ________ - Answer- remove fly ash from gases of combustion valve located between the boiler and water column must be ______ - Answer- locked or sealed open the boiling point of water. ________ with an increase in pressure - Answer- increases a hole is drilled in the end of a staybolt _______ - Answer- to warn of a corroded stay when taking a boiler off line, a vacuum is prevented by. _____ - Answer- opening the air cock a valve that requires five 360° turns of the hand wheel to change from fully open to fully closed is a. _______ valve - Answer- slow opening a thermostatic steam trap opens when the ______ - Answer- Bellows contract a combustion control on a boiler. _______ - Answer- controls the air-fuel ratio when coal is classified, ________ refers to hardness - Answer- rank _______ gauge glasses are used on boilers with precious exceeding 250 psi - Answer- flat oxygen and non condensable gases are removed from feed water by ________ - Answer- heating the water __________ combustion is when all fuel is burned using only the theoretical amount of air - Answer- perfect water tube boilers require less water than. _________ boilers - Answer- fire tube a boiler equipped with a draft gauge and registering a negative pressure indicates. _________ - Answer- atmospheric pressure is greater than furnace pressure pressure atomizing burners atomized fuel oil using _______ - Answer- a nozzle the. _________ on the steam turbine functions as a limit switch - Answer- overspeed trip circulating water passes through a surface condenser. ________ - Answer- inside the tubes The Pour point of a fuel oil is. ________ - Answer- the lowest temperature at which oil will flow

a condensate pump is located 75 ' below the feed water heater and its discharged gauge reads 75 PSI. The pressure at the inlet to the heater is. _______ psi - Answer-

a boiler burning fuel oil and using forced-draft requires. ________ cu ft a furnace volume per boiler horsepower - Answer-. a boiler evaporates 48,000 lb of steam/hr. it evaporates 12 lb of steam/sq ft of heating surface per hour. The boiler has _______ as ft of heating surface - Answer- 4000 a steam turbine exhaust end and condenser are prevented from excess pressure by ________ - Answer- the atmospheric relief valve at 0 psi, _______ btu are necessary to change 1 lb of water from and at 212°f into steam - Answer- 970. automatic toilets are program to ignite the burner ______ - Answer- in lowfire ________ boilers can operate at higher pressures than fire tube boilers - Answer- water tube the first step when using a soot blower is ________ - Answer- open Steam line drain the purpose of a vent on an open feedwater heater is to _______ - Answer- remove air and other non condensable gases cooling water and steam are in in direct contact with each other in a(n) ________ condenser - Answer- surface a boiler with 3450 sq ft of heating surface design for 5 sq ft of heating surface / BHP has ________ hp - Answer- 690 a water column _________ - Answer- dampens fluctuating water level a closed feedwater heater is always installed. ________ - Answer- on the discharge side of the feed water pump _________ is required for combustion - Answer- atomization of fuel, oxygen, and Heat heating value of natural gas is expressed in _______ - Answer- therms

  • Answer- spalling in a boiler occurs in the_______ - Answer- combustion chamber

economizers are used in Plants to _____ - Answer- heat feedwater using gases of combustion fuel oil with a high viscosity_______ - Answer- it's hard to pump boiler water is chemically treated to _____ - Answer- prevent scale from forming on the boiler heating surfaces steam pressure gauges are calibrated in _____ - Answer- pounds per square inch feed water temperature raised 10 degrees Fahrenheit from exhaustion or heat from gases of combustion result in an increase of ________% in plant efficiency - Answer- 1 the evaporation of 34.5 lb of water from and at 212°f is a standard for ______ - Answer- 1 bhp the tubes in a water tube boiler are fastened by ______ - Answer- rolling and expanding in drums and headers a dry pipe separator in a boiler _______ - Answer- maintains a high-quality Steam a (n) ________ valve offers the least resistance to flow - Answer- gate if valves are installed between the boiler and water column, they must be _______ - Answer- os&y or lever-type, locked or chained open steam withdrawn from a steam turbine under pressure control is __________ Steam - Answer- extraction in a closed feedwater heater, the_______ - Answer- Steam and water do not mix a compound gauge registers ________% - Answer- either vacuum or pressure a Norse that analyzer measures _________ in gases of combustion - Answer- carbon dioxide, oxygen, and carbon monoxide the fyrite analyzer can be used to measure - Answer- oxygen automatic combustion controls on a boiler control _______ - Answer- Fuel and air ratio if the firing rate increases on a boiler equipped with a convection type superheater, the superheater temperature will________ - Answer- increase a thermostatic steam trap can be used _________ - Answer- on high or low pressure systems

heat that changes the temperature of a substance but not its state is_________ - Answer- sensible heat _________is carrying over particles of water with the steam - Answer- priming if a boiler is equipped with an automatic non-return valve, it must be _______ - Answer- the valve closest to the boiler shell a broken baffle on a water tube boiler would cause ________ - Answer- increase in chimney temperature a feed water pump will become steam bound if the ________ - Answer- water temperature in the open feedwater heater is too high overheating of tubes in a water tube boiler result if_________ - Answer- scale builds up on the inside of the tubes complete combustion occurs when ______ - Answer- all combustible material is burned with a minimum of excess air according to the asme code, the adjusting of safety valves should be done by the ______ - Answer- manufacturer or authorized representative in a steam generating plant, the economizer is used to _______ - Answer- heat feed water when testing a safety valve by hand, the pressure on the boiler should be at least ___________% are the safety valve set pressure - Answer- 75 heat absorbed by water when changing from liquid to steam at the boiling point is ______ - Answer- latent heat to raise the temperature of 1 lb of water from 32°f to 212°f, ________ btu are needed - Answer- 180 baffles are placed between the tubes of a boiler to _________ - Answer- direct the travel of gases of combustion in a pressure atomizing fuel oil burner, atomization of fuel oil is produced by the. _________ - Answer- burner tip and high fuel oil pressure the steam Inlet connections of a condenser should be provided with. _______ - Answer- an atmospheric relief valve when a hydrostatic test is performed on a boiler, each safety valve should be _____ - Answer- blanked or gagged

in a surface condenser, the cooling water _______ - Answer- passes through the tubes a bypass damper on an air heater _______ - Answer- prevent moisture from collecting at low firing rates the minimum size manhole is. ______ - Answer- 11" x 15" the diameter of a chimney may have to be increased. ___________ - Answer- if the boiler smokes continually stay bolts are generally used on ______ - Answer- fire tube boilers before draining a boiler, _______ - Answer- allow the setting to cool cast iron water columns maybe use for pressures up to ______ psi. - Answer- 250 all high pressure boilers must have more than one method to determine water level : engaged glass and _______ - Answer- try cocks if dry saturated steam at 200 PSI is passing through a reducing valve and is reduced to 25 psi, it is ________ - Answer- superheated three boilers are connected to a common header and each boiler is carrying 100 PSI. The pressure gauge on the header reads. ______ psi - Answer- 100 _______ is caused by allowing sudden extreme changes of temperature in a furnace - Answer- spalling _________ is always necessary in the combustion process - Answer- oxygen water walls should be blown down ______ - Answer- when the furnace is cool an automatic non-return valve is used with a(n) _________^ - Answer- boiler feed water is treated chemically before it enters the boiler drum to ________ - Answer- change scale forming salts to a non adhering sludge