©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:52PM.
Commercial Boilers Final Exam Questions
And Answers 2025 Update.
A low pressure steam boiler has a MAWP of ____ psi.
a. 75
b. 35
c. 15
d. 50 - Answer✔c. 15
A horizontal return tubular (HRT) boiler is a ____ boiler.
a. firetube
b. watertube
c. scotch marine
d. none of the above - Answer✔a. firetube
Some watertube boilers are equipped with ____ to increase the heating surface and the life of
the furnace refractory.
a. stays
b. baffles
c. brickwork
d. waterwalls - Answer✔d. waterwalls
Watertube boilers were designed to operate at pressures as high as ____ psi, a point known as
the critical pressure of steam.
a. 512
b. 5000
c. 1015
d. 3205 - Answer✔d. 3205
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:52PM.
Boiler tubes are manufactured using materials that meet ____ specifications.
a. DOE
b. ASME
c. ABMA
d. ASTM - Answer✔b. ASME
The boiler superheater raises the temperature of the ____.
a. steam leaving the boiler
b. air for combustion
c. gases for combustion
d. feedwater - Answer✔a. steam leaving the boiler
At 0 psig, how many BTU are necessary to change one lb of water at 212 F into 1 lb of steam?
a. 1,190
b. 970
c. 144
d. 180 - Answer✔b. 970
Steam at 100 psi and 400 F is ____.
a. wet
b. saturated
c. superheated
d. none of the above - Answer✔c. superheated
Increasing the pressure has what effect on the boiling point of water?
a. temperature will increase 2 F for every psi
b. temperature will be raised
c. temperature will be lowered
d. no change - Answer✔b. temperature will be raised
Heat may be transferred in how many ways?
a. one
b. two
2
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:52PM.
c. three
d. four - Answer✔c. three
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 - Answer✔a. the amount of heat
needed to raise one pound of water one degree F
A boiler operating at 100 psi has a dry saturated steam temperature of 338 F. What is the
boiler's water temperature?
a. 180 F
b. 212 F
c. 309 F
d. 338 F - Answer✔d. 338 F
The purpose of a staybolt is to ____.
a. support the shell of the boiler
b. reinforce the heads of a firetube boiler
c. help make a watertube boiler safer to operate
d. strengthen and support flat plates of a firetube boiler - Answer✔d. strengthen and support
flat plates of a firetube boiler
A fusible plug melts at
a. 212 F
b. 450 F
c. 1000 F
d. none of the above - Answer✔b. 450 F
The purpose of the hole in the end of a 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
3
Commercial Boilers Final Exam Questions
And Answers 2025 Update.
A low pressure steam boiler has a MAWP of ____ psi.
a. 75
b. 35
c. 15
d. 50 - Answer✔c. 15
A horizontal return tubular (HRT) boiler is a ____ boiler.
a. firetube
b. watertube
c. scotch marine
d. none of the above - Answer✔a. firetube
Some watertube boilers are equipped with ____ to increase the heating surface and the life of
the furnace refractory.
a. stays
b. baffles
c. brickwork
d. waterwalls - Answer✔d. waterwalls
Watertube boilers were designed to operate at pressures as high as ____ psi, a point known as
the critical pressure of steam.
a. 512
b. 5000
c. 1015
d. 3205 - Answer✔d. 3205
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:52PM.
Boiler tubes are manufactured using materials that meet ____ specifications.
a. DOE
b. ASME
c. ABMA
d. ASTM - Answer✔b. ASME
The boiler superheater raises the temperature of the ____.
a. steam leaving the boiler
b. air for combustion
c. gases for combustion
d. feedwater - Answer✔a. steam leaving the boiler
At 0 psig, how many BTU are necessary to change one lb of water at 212 F into 1 lb of steam?
a. 1,190
b. 970
c. 144
d. 180 - Answer✔b. 970
Steam at 100 psi and 400 F is ____.
a. wet
b. saturated
c. superheated
d. none of the above - Answer✔c. superheated
Increasing the pressure has what effect on the boiling point of water?
a. temperature will increase 2 F for every psi
b. temperature will be raised
c. temperature will be lowered
d. no change - Answer✔b. temperature will be raised
Heat may be transferred in how many ways?
a. one
b. two
2
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:52PM.
c. three
d. four - Answer✔c. three
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 - Answer✔a. the amount of heat
needed to raise one pound of water one degree F
A boiler operating at 100 psi has a dry saturated steam temperature of 338 F. What is the
boiler's water temperature?
a. 180 F
b. 212 F
c. 309 F
d. 338 F - Answer✔d. 338 F
The purpose of a staybolt is to ____.
a. support the shell of the boiler
b. reinforce the heads of a firetube boiler
c. help make a watertube boiler safer to operate
d. strengthen and support flat plates of a firetube boiler - Answer✔d. strengthen and support
flat plates of a firetube boiler
A fusible plug melts at
a. 212 F
b. 450 F
c. 1000 F
d. none of the above - Answer✔b. 450 F
The purpose of the hole in the end of a 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
3
