Ohio Stationary Steam Engineer Practice2026/2027 Exam, with answers and
rationales /instant pdf
1. The primary purpose of a boiler safety valve is to:
A. Protect the boiler from excessive pressure
B. Maintain boiler water chemistry
C. Control fuel temperature
D. Increase steam pressure
Answer: A
Rationale: The safety valve automatically relieves pressure when the authorized set pressure is
reached.
2. A low-water cutoff is designed to:
A. Stop firing when the boiler water level becomes dangerously low
B. Increase feedwater pressure
C. Increase steam temperature
D. Control stack emissions
Answer: A
Rationale: Low-water protection helps prevent overheating of boiler heating surfaces.
3. Which condition is especially dangerous in a fired boiler?
A. Insufficient water covering heated surfaces
B. Proper water level
C. Normal feedwater temperature
D. Correct combustion
Answer: A
Rationale: Exposed heating surfaces can overheat and potentially fail.
4. Boiler pressure is commonly measured in:
A. PSI
B. Gallons
C. BTU only
D. Cubic feet
Answer: A
Rationale: Pounds per square inch is a common unit for boiler pressure.
5. What is the purpose of a boiler gauge glass?
A. Indicate the boiler water level
B. Measure fuel pressure
C. Measure stack temperature
D. Control steam temperature
,Answer: A
Rationale: The gauge glass provides a direct visual indication of water level.
6. If the water level disappears from the gauge glass, the operator should:
A. Treat the condition as potentially serious and follow the boiler's emergency procedure
B. Immediately increase firing
C. Disable the low-water cutoff
D. Assume the boiler is full
Answer: A
Rationale: Loss of visible water level can indicate a dangerous low-water condition.
7. What is boiler blowdown used for?
A. Control dissolved solids and remove sludge
B. Increase scale
C. Increase dissolved oxygen
D. Increase boiler pressure
Answer: A
Rationale: Blowdown removes concentrated boiler water and suspended solids.
8. Excessive boiler-water dissolved solids can contribute to:
A. Foaming and steam carryover
B. Improved steam purity
C. Elimination of scale
D. Reduced conductivity
Answer: A
Rationale: High dissolved-solids concentrations can contribute to foaming and carryover.
9. What is the primary purpose of a deaerator?
A. Remove dissolved gases from feedwater
B. Increase oxygen concentration
C. Remove steam from the boiler
D. Increase fuel pressure
Answer: A
Rationale: Removing dissolved oxygen helps reduce corrosion in boiler/feedwater systems.
10. What is boiler scale?
A. Mineral deposits on heat-transfer surfaces
B. Condensed steam
C. Fuel residue in the burner
D. Compressed air
, Answer: A
Rationale: Hardness minerals can precipitate and form deposits on heated surfaces.
11. Why is scale dangerous?
A. It reduces heat transfer and can cause overheating
B. It improves boiler efficiency
C. It eliminates corrosion
D. It increases circulation
Answer: A
Rationale: Scale acts as an insulating layer between the heat source and boiler water.
12. What is the purpose of an economizer?
A. Use flue-gas heat to preheat feedwater
B. Cool feedwater
C. Remove sludge
D. Increase water hardness
Answer: A
Rationale: Economizers recover waste heat and improve boiler efficiency.
13. What is a superheater used for?
A. Raise steam temperature above its saturation temperature
B. Condense steam
C. Remove dissolved solids
D. Lower feedwater temperature
Answer: A
Rationale: A superheater adds sensible heat to saturated steam.
14. What is a steam trap designed to do?
A. Remove condensate while limiting loss of live steam
B. Increase boiler pressure
C. Add water to the steam line
D. Remove dissolved oxygen
Answer: A
Rationale: Steam traps discharge condensate and, depending on design, non-condensable gases.
15. What is water hammer?
A. A pressure surge caused by sudden changes in fluid flow
B. Normal boiler circulation
C. A water-treatment method
D. A type of safety valve
rationales /instant pdf
1. The primary purpose of a boiler safety valve is to:
A. Protect the boiler from excessive pressure
B. Maintain boiler water chemistry
C. Control fuel temperature
D. Increase steam pressure
Answer: A
Rationale: The safety valve automatically relieves pressure when the authorized set pressure is
reached.
2. A low-water cutoff is designed to:
A. Stop firing when the boiler water level becomes dangerously low
B. Increase feedwater pressure
C. Increase steam temperature
D. Control stack emissions
Answer: A
Rationale: Low-water protection helps prevent overheating of boiler heating surfaces.
3. Which condition is especially dangerous in a fired boiler?
A. Insufficient water covering heated surfaces
B. Proper water level
C. Normal feedwater temperature
D. Correct combustion
Answer: A
Rationale: Exposed heating surfaces can overheat and potentially fail.
4. Boiler pressure is commonly measured in:
A. PSI
B. Gallons
C. BTU only
D. Cubic feet
Answer: A
Rationale: Pounds per square inch is a common unit for boiler pressure.
5. What is the purpose of a boiler gauge glass?
A. Indicate the boiler water level
B. Measure fuel pressure
C. Measure stack temperature
D. Control steam temperature
,Answer: A
Rationale: The gauge glass provides a direct visual indication of water level.
6. If the water level disappears from the gauge glass, the operator should:
A. Treat the condition as potentially serious and follow the boiler's emergency procedure
B. Immediately increase firing
C. Disable the low-water cutoff
D. Assume the boiler is full
Answer: A
Rationale: Loss of visible water level can indicate a dangerous low-water condition.
7. What is boiler blowdown used for?
A. Control dissolved solids and remove sludge
B. Increase scale
C. Increase dissolved oxygen
D. Increase boiler pressure
Answer: A
Rationale: Blowdown removes concentrated boiler water and suspended solids.
8. Excessive boiler-water dissolved solids can contribute to:
A. Foaming and steam carryover
B. Improved steam purity
C. Elimination of scale
D. Reduced conductivity
Answer: A
Rationale: High dissolved-solids concentrations can contribute to foaming and carryover.
9. What is the primary purpose of a deaerator?
A. Remove dissolved gases from feedwater
B. Increase oxygen concentration
C. Remove steam from the boiler
D. Increase fuel pressure
Answer: A
Rationale: Removing dissolved oxygen helps reduce corrosion in boiler/feedwater systems.
10. What is boiler scale?
A. Mineral deposits on heat-transfer surfaces
B. Condensed steam
C. Fuel residue in the burner
D. Compressed air
, Answer: A
Rationale: Hardness minerals can precipitate and form deposits on heated surfaces.
11. Why is scale dangerous?
A. It reduces heat transfer and can cause overheating
B. It improves boiler efficiency
C. It eliminates corrosion
D. It increases circulation
Answer: A
Rationale: Scale acts as an insulating layer between the heat source and boiler water.
12. What is the purpose of an economizer?
A. Use flue-gas heat to preheat feedwater
B. Cool feedwater
C. Remove sludge
D. Increase water hardness
Answer: A
Rationale: Economizers recover waste heat and improve boiler efficiency.
13. What is a superheater used for?
A. Raise steam temperature above its saturation temperature
B. Condense steam
C. Remove dissolved solids
D. Lower feedwater temperature
Answer: A
Rationale: A superheater adds sensible heat to saturated steam.
14. What is a steam trap designed to do?
A. Remove condensate while limiting loss of live steam
B. Increase boiler pressure
C. Add water to the steam line
D. Remove dissolved oxygen
Answer: A
Rationale: Steam traps discharge condensate and, depending on design, non-condensable gases.
15. What is water hammer?
A. A pressure surge caused by sudden changes in fluid flow
B. Normal boiler circulation
C. A water-treatment method
D. A type of safety valve
