COMMERCIAL BOILERS FINAL EXAM QUESTIONS AND 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 ____.
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 - CORRECT ANSWER✅✅a. the amount of
heat needed to raise one pound of water one degree F
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 ____.
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 - CORRECT ANSWER✅✅a. the amount of
heat needed to raise one pound of water one degree F
