3 RD Class Stationary Engineers Examination With answers ;; 100% guaranteed pass, Exams of Engineering

Download 3 RD Class Stationary Engineers Examination With answers ;; 100% guaranteed pass and more Exams Engineering in PDF only on Docsity!

RD

Class Stationary Engineers Examination

With answers ;; 100% guaranteed pass

_________ 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

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/ 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 42. 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

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