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3rd class stationary steam
engineer license prep questions
and correct answers 2025
______ draft is produced by a fan located between the boiler and the chimney - ANSinduced _______ gauge glasses are used on boilers with precious exceeding 250 psi - ANSflat _______ is caused by allowing sudden extreme changes of temperature in a furnace - ANSspalling ________ boilers can operate at higher pressures than fire tube boilers - ANSwater tube _________ are necessary for complete combustion - ANStime, temperature, mixture, and atomization _________ is always necessary in the combustion process - ANSoxygen _________ is required for combustion - ANSatomization of fuel, oxygen, and Heat
__________ combustion is when all fuel is burned using only the theoretical amount of air - ANSperfect __________ steam turbines allow condensate to be reclaimed for use in the system - ANScondensing _________is carrying over particles of water with the steam - ANSpriming a ________ allows condensate to pass through, but stops Steam. - ANSa steam trap a ________ pump is a positive displacement pump - ANSreciprocating a (n) ________ valve offers the least resistance to flow - ANSgate a boiler burning fuel oil and using forced-draft requires. ________ cu ft a furnace volume per boiler horsepower - ANS. a boiler connected in battery requires a free blowing drain between the two stop valves when the ______ - ANSboiler has a manhole opening a boiler equipped with a draft gauge and registering a negative pressure indicates. _________ - ANSatmospheric pressure is greater than furnace pressure
a broken baffle on a water tube boiler would cause ________ - ANSincrease in chimney temperature a bypass damper on an air heater _______ - ANSprevent moisture from collecting at low firing rates a chimney temperature of 250 degrees Fahrenheit above steam temperature indicates_______ - ANSpoor efficiency a closed feedwater heater is always installed_______ - ANSon the discharge side of the feed water pump a closed feedwater heater is always installed. ________ - ANSon the discharge side of the feed water pump a combustion control on a boiler. _______ - ANScontrols the air-fuel ratio a compound gauge registers ________% - ANSeither vacuum or pressure 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 - ANS42. a continuous blowdown line is located___ - ANSin the Steam and water drum well below the nowl
a deposit of scale or mud in an HRT boiler could cause_____ - ANSa bag to develop a dry pipe separator _____ - ANSdelivers higher-quality steam to the header a dry pipe separator in a boiler _______ - ANSmaintains a high-quality Steam a duplex double-acting reciprocating feed water pump has____ - ANSto steam Pistons 2 to 2 2/2 times larger in area than the water piston a duplex reciprocating feed water pump operates on the principle that the _______ - ANSsteam piston area must be 2 to 2 1/2 times larger than the water piston a feed water pump will become steam bound if the ________ - ANSwater temperature in the open feedwater heater is too high a flame rod_______ - ANSensures that the gas pilot is lighted a flame scanner proves (verifies) __________ - ANSpilot in Maine Flame a gas pressure regulator is used to control the ______ - ANSgas pressure at the burner a glass is used to ______ - ANSindicate the water level in the boiler
a ringelmann test is used to determine_______ - ANSsmoke density a safety valve on a boiler pops______ - ANSbetween working pressure and mawp a scotch Marine boiler is easily identified because it_____ - ANShas a cylindrical internal furnace a steam pressure gauge has a siphon between the boiler and the pressure gauge to _______ - ANSprevent Steam from entering the pressure gauge a steam pressure gauge is protected against excessive temperature by a ______ - ANSsiphon a steam pressure gauge must have a range of at least. _______ - ANS 1/2 time's the mawp a steam trap ______ - ANSautomatically remove sand and water without loss of steam a steam turbine exhaust end and condenser are prevented from excess pressure by ________ - ANSthe atmospheric relief valve a steam turbine operating at 3600 RPM will trip at_________ rpm - ANS
a sudden rise in chimney temperature with no increase in load indicates______ - ANSthere is a broken baffle a surface condenser is one that______ - ANShas circulating water flowing through the tubes and exhaust steam around the outside of the tubes a temperature reading of 80 degrees Celsius is equal to_________°f - ANS a thermostatic steam trap can be used _________ - ANSon high or low pressure systems a thermostatic steam trap opens when the ______ - ANSBellows contract a thermostatic trap opens when the____ - ANSthe Bellows contract a valve that requires five 360° turns of the hand wheel to change from fully open to fully closed is a. _______ valve - ANSslow opening a water column _________ - ANSdampens fluctuating water level a water column______ - ANSreduces fluctuations of water in the gauge glass 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 - ANS
an economizer located in the path of the gases of combustion increased boiler efficiency approximately 1% for each ___°f rise in feed water temperature - ANS an oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-generator - ANSsteam turbine approximately. _______^ of air is required to completely burn 1 lb of fuel oil
- ANS15 lb as steam pressure in a boiler increases, there is a corresponding increase in the ______ - ANStemperature of steam and water at 0 psi, _______ btu are necessary to change 1 lb of water from and at 212°f into steam - ANS970. at atmospheric pressure, water boils and turns to steam at _____ °f - ANS automatic combustion controls on a boiler control _______ - ANSFuel and air ratio automatic toilets are program to ignite the burner ______ - ANSin lowfire baffles are placed between the tubes of a boiler to _________ - ANSdirect the travel of gases of combustion
baffles are used in the Steam and water drum of water tube boilers to _____ - ANSprevent water carry over with the steam baffles in the boiler are designed to direct gases of combustion for close contact with the ________ - ANSboiler heating surface balanced draft is______ - ANSconstant furnace pressure slightly below atmospheric pressure before draining a boiler, _______ - ANSallow the setting to cool before lighting off a boiler during a cold startup, the operator must first______ - ANScheck for the correct water level before using blowers on a boiler,________ - ANSdrain set blower lines before using soap blowers, it is necessary to______ - ANSopen the steam line on the soot blower blowers are normally used with________ boilers - ANSwater tube boiler should be warmed up slowly when starting up to ______ - ANSallow uniform expansion of drums and tubes boiler water is chemically treated to _____ - ANSprevent scale from forming on the boiler heating surfaces
combustion controls on a boiler are used to _____ - ANScontrol the air fuel ratio combustion efficiency can be increased when air is________ - ANSpreheated combustion requires____ - ANSfuel, oxygen, and Heat complete combustion occurs when ______ - ANSall combustible material is burned with a minimum of excess air cooling water and steam are in in direct contact with each other in a(n) ________ condenser - ANSsurface desuperheater drain is used to_______ - ANSestablish steam flow downcomer tubes are found _____ - ANSin a water tube boiler draft is carefully controlled to_____ - ANScompletely burn fuel supplied to the burner draft is measured with a_________ - ANSmanometer during a boiler inspection, the main steam stop valves are _______ - ANSclosed, locked, and tagged
economizers are used in Plants to _____ - ANSheat feedwater using gases of combustion electrostatic precipitators are used in the power plants to ________ - ANSremove fly ash from gases of combustion extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ____ psi - ANS extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______ psi - ANS feed water is treated chemically before it enters the boiler drum to ________ - ANSchange scale forming salts to a non adhering sludge feed water temperature raised 10 degrees Fahrenheit from exhaustion or heat from gases of combustion result in an increase of ________% in plant efficiency - ANS four basic systems found on boilers are ______< - ANSsteam, feed water, fuel, and draft fuel oil with a high viscosity_______ - ANSit's hard to pump hard scale formed on the inside of tubes is best removed by________ - ANSair- or water-driven turbines
if repairs are to be made on a safety valve, they must be made by the. _______/ - ANSmanufacturer of the safety valve or authorized representative if the burner is firing and no water is in the gauge glass, the best procedure to follow is to_______ - ANSshut down the burner and secure the boiler if the chimney temperature is 250 degrees Fahrenheit higher than the Steam and water temperature, the boiler is _______ - ANSnot operating efficiently if the firing rate increases on a boiler equipped with a convection type superheater, the superheater temperature will________ - ANSincrease if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ - ANS214. if valves are installed between the boiler and water column, they must be _______ - ANSos&y or lever-type, locked or chained open in a closed feedwater heater, the _________ - ANSSteam and water do not mix in a closed feedwater heater, the_______ - ANSSteam and water do not mix
in a fire tube boiler, the Heat and gases of combustion pass _________ - ANSthrough the tubes in a pressure atomizing fuel oil burner, atomization of fuel oil is produced by the. _________ - ANSburner tip and high fuel oil pressure in a steam generating plant, the economizer is used to _______ - ANSheat feed water in a surface condenser, the cooling water _______ - ANSpasses through the tubes in a water tube boiler, heat and gases of combustion pass______ - ANSaround the tubes in order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer should______ - ANSblowdown the gauge glass in order to reduce the viscosity of a fuel oil, it's. _______ - ANStemperature must be increased incomplete combustion can be caused by ______ - ANSinsufficient air it is permissible to have one blowdown valve on a boiler operated under______ psi - ANS
package boilers are programmed to _____ - ANSignite the burner in low fire pre-purge, air to fuel ratio, and post Purge of the burner are functions of the _______ - ANScombustion controls pressure atomizing burners atomized fuel oil using _______ - ANSa nozzle safety valve repair should be done by the________ - ANSsafety valve manufacturer or an authorized representative sensible heat is heat that ______ - ANSchanges the temperature of a substance but not its state sensible heat is heat that_____ - ANSchanges a substances temperature but not its state sensible heat is______ - ANSheat that can be measured with a thermometer sewer lines are protected from pressure and temperature by the _______ when blowing down a boiler - ANSblowdown tank spalling in a boiler occurs in the_______ - ANScombustion chamber stay bolts are generally used on ______ - ANSfire tube boilers
steam at a temperature of 350 degrees Fahrenheit and a pressure of 50 psi is______ - ANSsuperheated steam at E250 psia and 400 degrees Fahrenheit is considered______ Steam - ANSsaturated steam pressure gauges are calibrated in _____ - ANSpounds per square inch steam pressure gauges are calibrated in____ - ANSpounds per square inch steam withdrawn from a steam turbine under pressure control is __________ Steam - ANSextraction sup blowers are most commonly found ______ - ANSon water tube boilers the air flow switch at the burner fan housing________ - ANSand shows the primary air fan is functioning the amount of excess air in gases of combustion is normally determined by the analysis of______ - ANSO the asme code recommends that low water fuel cutoff switch be tested by an evaporation test__________ - ANSmonthly
