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MA 2nd Class Fireman's Practice Exam-with 100% verified solutions 2024-2025.docx, Exams of Nursing

MA 2nd Class Fireman's Practice Exam-with 100% verified solutions 2024-2025.docx

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MA 2nd Class Fireman's Practice Exam-with

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At 0 PSIG, how many BTU are necessary to change 1 lb of water at 212 degrees Fahrenheit into 1 lb of steam? a) 144 b) 180 c) 970 d) 1, c) 970 Radiation is a) the movement of liquids or gases created by a temperature difference. b) the transfer of heat by direct molecular contact. c) the weight of a substance compared to unity. d) a form of heat transfer by waves. d) a form of heat transfer by waves. Steam at 100 PSI and 400 degrees Fahrenheit is a) saturated. b) wet. c) superheated. d) none of the above. c) superheated Which of the following most closely defines sensible heat?

a) An established relationship comparing any substance to the heat content of water b) Heat quantity that can be felt or measured by a thermometer. c) Heat quantity above the point of saturation d) Measure of heat intensity. b) Heat quantity that can be felt or measured by a thermometer What is required to raise the temperature of 1 lb of water from 32 degrees to 212 degrees Fahrenheit? a) 144 Btu b) 180 Btu c) 970.3 Btu d) Saturated heat b) 180 Btu Increasing the pressure has what effect on the boiling point of water? a) No change b) Temperature will be lowered c) Temperature will be raised d) Temperature will increase 2 degrees Fahrenheit for every PSI c) Temperature will be raised Heat absorbed by water when it changes from liquid to steam at the boiling point is called a) sensible heat. b) latent heat. c) specific heat. d) superheat b) latent heat

Heat may be transferred in how many ways? a) One b) Two c) Three d) Four c) Three A boiler horsepower is defined as a) 970.3 Btuh. b) total heating surface times the factor of evaporation. c) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per hour d) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per 8 hours. c) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per hour A boiler's steam pressure gauge reads 150. What is the absolute pressure? a) 14. b) 135. c) 150 d) 164. c) 150 What does 212 degrees F equal on the Celsius scale? a) 32 b) 100 c) 180 d) 970. b) 100

One boiler horsepower is equal to how many Btu? a) 970. b) 33, c) 125, d) One therm b) 33, A British thermal unit is a) the amount of heat needed to raise one pound of water one degree F b) the amount of heat needed to raise one pound of steam one degree F c) a unit of temperature measurement. d) the amount of heat in water between freezing and boiling. a) the amount of heat needed to raise one pound of water one degree F Hydronic heat is a) steam heat b) hot water heat c) radiant heat d) heat of evaporation b) hot water heat Superheated steam is a) reheated steam b) very hot steam c) flash steam d) saturated steam a) reheated steam

2,545 Btu represents a) 1 bhp b) 1 kilowatt-hour c) 1 horsepower-hour d) 1 therm c) 1 horsepower-hour A throttling calorimeter is used to measure the quality of a) dry steam b) saturated steam c) superheated steam d) Btu in coal b) saturated steam The amount of heat in one pound of saturated steam is approximately equal to a) 970.3 Btu b) 1,150 Btu c) 3,412 Btu d) 100,000 Btu b) 1,150 Btu A boiler operating at 100 PSI has a dry saturated steam temperature of 338 degrees F. What is the boilers water temperature? a) 180 degrees F b) 212 degrees F

c) 309 degrees F d) 338 degrees F d) 338 degrees F A dry pipe is used to a) separate moisture from steam as it leaves the drum. b) separate moisture from steam as it leaves the superheater. c) separate moisture from steam at the turbine throttle. d) increase superheater temperature. a) separate moisture from steam as it leaves the drum The purpose of a staybolt is to a) support the shell of the boiler. b) reinforce the heads of a fire-tube boiler. c) help make a water-tube boiler safer to operate. d) strengthen and support flat plates of a fire-tube boiler. d) strengthen and support flat plates of a fire-tube boiler The boiler vent valve is located on the a) top of the steam drum. b) bottom of the steam drum. c) top of the mud drum. d) top of the water drum. a) top of the steam drum

The purpose of the hole in the end of the staybolt is to a) indicate how much water is in the boiler. b) indicate that a staybolt is cracked or broken. c) help the boiler operator operate more efficiently. d) provide means of attaching insulation to a boiler. b) indicate that a staybolt is cracked or broken A fusible plug melts at a) 212 degrees F b) 450 degrees F c) 1,000 degrees F d) none of the above b) 450 degrees F As the firing rate increases in a boiler equipped with a convection superheater, the steam temperature a) increases b) decreases c) stays constant d) both increases and decreases a) increases When boilers are connected to a common header, it is required that an ample free blowing drain be provided between the stop valves if either or both boilers have a) handholes b) manholes

c) over 10 tubes or flues d) more than one safety valve b) manholes It is permissable to have only one bottom blowdown valve on a boiler when the a) MAWP does not exceed 100 PSI b) MAWP exceeds 125 PSI c) heating surface does not exceed 100 ft^ d) heating surface does not exceed 500 ft^ a) MAWP does not exceed 100 PSI When the boiler pressure exceeds ______ PSI, it is required that extra- heavy pipe be used on the blowoff system. a) 15 b) 100 c) 125 d) 150 c) 125 Baffles are placed between the tubes of a boiler for the purpose of a) slowing down the rate of combustion. b) preventing priming. c) bracing the tube bank. d) directing the travel of flue gases d) directing the travel of flue gases

A boiler has a steaming capacity of 35,500 lb of steam per hour. The evaporation rate is 10 lb/ft^2 of heating surface per hour. What is the horsepower rating of this boiler? a) 100 b) 1, c) 3, d) 6, b) 1, Boiler tube sizes are specified by a) pipe size. b) standard ASME size. c) inside diameter. d) outside diameter. d) outside diameter The maximum size of boiler blowdown lines, valves, and fittings shall not exceed a) 1 inch b) 1.5 inches c) 2 inches d) 2.5 inches d) 2.5 inches The purpose of an expansion tank in a hot water heating system is to provide for the expansion of

a) water b) hot air c) air and steam d) not used in hot water systems a) water Heavy accumulation of soot in a boiler will result in a) loss of boiler efficiency b) loss of the fire c) reduced stack temperature d) the safety valve popping a) loss of boiler efficiency How are the tubes secured in a fire-tube boiler? a) Welded b) Brazed c) Rolled and beaded over d) Shrink fit c) Rolled and beaded over A tube in a fire-tube boiler is surrounded by a) water b) air c) flue gases d) steam a) water

Atmospheric pressure is considered to be a) 0 psia. b) 14.7 in. Hg. c) 14.7 psia. d) 14.7 psig. c) 14.7 psia In a water tube boiler, a) flue gas passes inside the tube. b) flue gas surrounds the tube. c) water surrounds the tube. d) none of the above. b) flue gas surrounds the tube Diagonal stays are found in a) fire-tube boilers b) water-tube boilers c) cast-iron boilers d) waste heat boilers a) fire-tube boilers Handholes and manholes are oval a) to withstand higher pressures b) for ease of fabrication

c) for better sealing d) for removal from a pressure vessel d) for removal from a pressure vessel To check the water level in the gauge glass of a steam boiler a) use the bottom blowoff valve b) use the trycocks c) blow down the low-water cutoff d) compare it with the water level in another boiler b) use the try cocks The vent valve a) removes air during warm-up b) prevents a vacuum from forming during cooldown c) Both a and b d) Neither a nor b c) Both a and b A high-pressure boiler has its safety valve set above a) 15 PSI b) 100 PSI c) 125 PSI d) 150 PSI a) 15 PSI

Which of the following is an advantage of fire-tube boilers over water tube boilers? a) Low initial cost b) Capable of higher pressures c) Lower possibility of explosions d) Able to fire a larger variety of fuels a) Low initial cost Water walls are found a) where the flue gas exits the boiler b) in fire-tube boiler furnaces c) in water-tube boiler furnaces d) in the air heater of a water-tube boiler c) in water-tube boiler furnaces The best time to bottom blow a boiler is at a) high load under full pressure b) low load under full pressure c) high load under partial pressure d) low load under partial pressure b) low load under full pressure A telltale hole is found in a a) dry pipe b) crown sheet c) fusible plug

d) stay bolt d) stay bolt A 2-inch boiler tube has a wall thickness of 3/16 inch. What is its inside diameter (ID)? a) 2-3/16 inches b) 2 inches c) 1-13/16 inches d)1-5/8 inches d) 1-5/8 inches At what temperature does steel start to rapidly lose its strength? a) 500 degrees F b) 700 degrees F c) 1,000 degrees F d) 1,500 degrees F b) 700 degrees F A hot-water heating system is about to be started. How full of water should the expansion tank gauge glass be? a) Empty b) 1/ c) 3/ d) Full b) 1/

What is the relationship between longitudinal stress and circumferential stress? a) They are the same b) Longitudinal stress is twice circumferential stress c) Circumferential stress is twice longitudinal stress d) There is no fixed relationship between the two b) Longitudinal stress is twice circumferential stress A therm is equal to how many Btu? a) 970. b) 33, c) 100, d) 1,000, c) 100, The factor of evaporation is a) heat added to the boiler divided by 970. b) heat added to the boiler minus inlet feedwater temperature c) 970.3 Btu d) actual evaporation over 34.5 lb of water a) heat added to the boiler divided by 970. The purpose of a bottom blowdown is to a) reduce boiler pressure b) remove sludge and sediment c) increase dissolved solids

d) remove floating oil b) remove sludge and sediment Damage by spalling refers to the a) tubes b) steam drum c) refractory d) superheater c) refractory Superheaters raise the temperature of a) feedwater b) boiler water c) combustion air d) steam d) steam The steam space is a) the area covered by fire and water b) in the main header area c) the top half of most steam traps d) the area above the operating water level d) the area above the operating water level The heating surface of a boiler is the area

a) exposed to the flame and flue gases b) in contact with steam c) of the furnace d) of the burner face in the furnace a) exposed to the flame and flue gases The purpose of a superheater is to a) heat steam above its saturation temperature b) boost the steam pressure c) add heat to the combustion air d) add heat to the incoming feedwater a) heat steam above its saturation temperature What is the formula for the factor of evaporation? a) h-H/970.3 Btu b) H-b/970.3 Btu c) 970.3 Btu/H-h d) 970.3 Btu/h-H b) H-b/970.3 Btu What can cause a superheater tube to overheat? a) Not draining before starting b) Overfiring c) Poor boiler circulating d) Dirty tube d) Dirty tube

A boiler has a steaming capacity of 34,500 lb of steam per hour. The evaporation rate is 10lb/ft^2 of heating surface per hour. What is the boiler heating surface? a) 100 b) 1, c) 3, d) 6, c) 3, How many square feet of heating surface does a 3-inch fire-tube 20 ft long with a 3/16-inch wall have? a) 13. b) 14. c) 15. d) 16.

In a high-temperature hot water boiler, what would cause a tube to overheat? a) Dirty economizer tubes b) High economizer feedwater outlet temperature c) Feedwater temperature too high d) Poor circulation (plugged tube) d) Poor circulation (plugged tube)

A downcomer is a) located in a fire-tube boiler b) one of the tubes that supports the furnace c) used to circulate flue gas d) found in a water-tube boiler d) found in a water-tube boiler Extreme firebox temperature changes cause a) spalling b) lower stack temperatures c) increased soot deposits d) a rise in stack temperature a) spalling The low-water cutoff a) feeds the boiler when it is low on water b) shuts off the burner when the boiler is low on water c) dumps the boiler d) cuts off the water supply when the level is too high b) shuts off the burner when the boiler is low on water Steam coming from the bottom try cock would indicate a) normal water level b) high water level c) low water level d) normal steam level

c) low water level What type of valve has the most resistance to flow? a) Globe b) Gate c) Ball d) Butterfly a) Globe When checking the water level of a boiler, a) ask the boiler operator b) test the safety valve c) use the bottom blowdown valve d) blow down the gauge glass and water column d) blow down the gauge glass and water column A siphon or pigtail is used to protect a steam pressure gauge a) from steam temperature b) against high steam pressure c) against high water pressure d) against an excessive amount of steam a) from steam temperature The feedwater regulator is located a) on the right side of the boiler

b) at the normal operating water level c) two inches below the highest heating surface d) next to the fusible plug b) at the normal operating water level An automatic feedwater regulator a) ensures the proper water level in the boiler b) shuts off the burner c) controls the boiler's operating range d) is never used on high pressure boilers a) ensures the proper water level in the boiler To test the low-water cutoff, a) the burner must be off b) there must be no pressure on the boiler c) the fuel must be shut off d) the burner must be firing d) the burner must be firing The purpose of testing a safety valve by hand is to a) make sure the valve can lift b) check the operating range of the boiler c) check its popping pressure d) They are never tested by hand a) make sure the valve can lift

The automatic control that protects a boiler from being dry fired is the a) aquastat b) vaporstat c) flame failure cutoff d) low-water cutoff d) low-water cutoff To check the water level in the gauge glass of a steam boiler, a) use the bottom blowoff valve b) blow down the low-water cutoff c) blow down the gauge glass and water column d) compare it with the water level in another boiler c) blow down the gauge glass and water column On a steam boiler, testing the operation of the safety valve by hand with the boiler under pressure should be done a) at the start of each heating session b) daily c) never d) monthly d) monthly What type of valve has the least resistance to flow? a) Globe b) Gate

c) Reducing d) Needle b) Gate The gauge glass shows full while the middle try cock shows steam. When blown down, the gauge glass refills. What is the probable cause? a) Feedwater regulator is stuck open b) Feed pump is running too fast c) Top gauge glass connection is blocked d) Both top and bottom gauge glass connections are blocked c) Top gauge glass connection is blocked The purpose of a bowl at the bottom of the water column is to a) serve as a condenser b) serve as a sediment chamber c) serve as a siphon d) none of the above b) serve as a sediment chamber When checking a safety valve with the hand-lifting gear, the pressure should be no lower than ____% of the safety valve set pressure. a) 30 b) 50 c) 75 d) 100 c) 75%

If valves are located between the boiler and water column, they must be a) locked or sealed open b) regular globe valves c) steel and rated at 300 PSI d) protected against accidental opening a) locked or sealed open When a hydrostatic test is put on a boiler, each safety valve should be a) set at its maximum allowable working pressure b) set at twice its popping pressure c) held to its seat by screwing down the compression screw d) held to its seat by means of a testing clamp d) held to its seat by means of a testing clamp After installing a new gauge glass, the proper procedure for returning the glass to service is a) crack open both the top and bottom valves b) open the drain and crack both the bottom and top valves c) open the drain and crack open the top valve d) open the drain and crack open the bottom valve c) open the drain and crack open the top valve The steam pressure gauge is graduated in a) absolute pressure b) inches of pressure

c) pounds per square inch d) pounds per square foot c) pounds per square inch One of the purposes of the water column is to a) indicate to the operator the level of the water in the boiler b) easily find the pressure in the boiler c) dampen the oscillation of the water in the gauge glass d) prevent the boiler from priming c) dampen the oscillation of the water in the gauge glass The gauge glass should be blown down a) daily b) weekly c) monthly d) yearly a) daily The flame failure control is tested by a) blowing down the low-water cutoff b) adjusting the pressuretrol c) calling the inspector d) securing the fuel supply to the burner d) securing the fuel supply to the burner