Commercial Boilers Final Exam UPDATED
Study Guide ACTUAL QUESTIONS AND
CORRECT ANSWERS
Define sensible heat. How is it measured? - CORRECT ANSWER
Define enthalpy of steam. - CORRECT ANSWER
What is the definition of a boiler? - CORRECT ANSWER
What is the difference between forced circulation and natural circulation? What is used to
help increase natural circulation in a drum type boiler? - CORRECT ANSWER
Explain the operation of steam in a cyclone separator. - CORRECT ANSWER
Define boiler heating surface. - CORRECT ANSWER
How might you know that a gas baffle has broken in a boiler? - CORRECT ANSWER
Name three types of watertube boilers. What is the difference between a watertube boiler and
a firetube boiler? - CORRECT ANSWER
A low pressure steam boiler has a MAWP of ____ psi.
a. 75
b. 35
c. 15
d. 50 - CORRECT ANSWER c. 15
,A horizontal return tubular (HRT) boiler is a ____ boiler.
a. firetube
b. watertube
c. scotch marine
d. none of the above - CORRECT 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 - CORRECT 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 - CORRECT ANSWER d. 3205
Boiler tubes are manufactured using materials that meet ____ specifications.
a. DOE
b. ASME
c. ABMA
d. ASTM - CORRECT 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 - CORRECT 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 - CORRECT ANSWER b. 970
Steam at 100 psi and 400 F is ____.
a. wet
b. saturated
c. superheated
d. none of the above - CORRECT 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 - CORRECT ANSWER b. temperature will be raised
Heat may be transferred in how many ways?
a. one
b. two
c. three
d. four - CORRECT ANSWER c. three
A British thermal unit is ____.
Study Guide ACTUAL QUESTIONS AND
CORRECT ANSWERS
Define sensible heat. How is it measured? - CORRECT ANSWER
Define enthalpy of steam. - CORRECT ANSWER
What is the definition of a boiler? - CORRECT ANSWER
What is the difference between forced circulation and natural circulation? What is used to
help increase natural circulation in a drum type boiler? - CORRECT ANSWER
Explain the operation of steam in a cyclone separator. - CORRECT ANSWER
Define boiler heating surface. - CORRECT ANSWER
How might you know that a gas baffle has broken in a boiler? - CORRECT ANSWER
Name three types of watertube boilers. What is the difference between a watertube boiler and
a firetube boiler? - CORRECT ANSWER
A low pressure steam boiler has a MAWP of ____ psi.
a. 75
b. 35
c. 15
d. 50 - CORRECT ANSWER c. 15
,A horizontal return tubular (HRT) boiler is a ____ boiler.
a. firetube
b. watertube
c. scotch marine
d. none of the above - CORRECT 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 - CORRECT 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 - CORRECT ANSWER d. 3205
Boiler tubes are manufactured using materials that meet ____ specifications.
a. DOE
b. ASME
c. ABMA
d. ASTM - CORRECT 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 - CORRECT 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 - CORRECT ANSWER b. 970
Steam at 100 psi and 400 F is ____.
a. wet
b. saturated
c. superheated
d. none of the above - CORRECT 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 - CORRECT ANSWER b. temperature will be raised
Heat may be transferred in how many ways?
a. one
b. two
c. three
d. four - CORRECT ANSWER c. three
A British thermal unit is ____.
