MASSACHUSETTS STATIONARY ENGINEER
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a boiler’s safety valve?
A. To increase boiler efficiency
B. To release excess pressure
C. To control fuel consumption
D. To measure water level
Rationale: Safety valves prevent pressure from exceeding safe
limits, protecting the boiler and personnel.
Correct Answer: B
2. Which type of fuel is commonly used in large stationary
boilers?
A. Diesel
B. Natural Gas
C. Coal
D. All of the above
Rationale: Boilers can operate on various fuels depending on
design, with diesel, natural gas, and coal being common.
Correct Answer: D
3. What is the purpose of a deaerator in a boiler system?
A. To heat feedwater
B. To remove dissolved gases
,C. To increase steam pressure
D. To circulate water
Rationale: A deaerator removes oxygen and carbon dioxide to
prevent corrosion in the boiler system.
Correct Answer: B
4. What does “superheated steam” refer to?
A. Steam at 212°F
B. Steam above boiling point without water droplets
C. Steam saturated with water
D. Condensed steam
Rationale: Superheated steam is heated beyond its boiling
point and contains no water droplets, improving energy
transfer.
Correct Answer: B
5. What is the function of a feedwater pump?
A. To generate steam
B. To circulate condensate
C. To supply water to the boiler
D. To control pressure
Rationale: Feedwater pumps ensure continuous water supply
to maintain boiler water levels.
Correct Answer: C
6. What is the main cause of boiler tube failure?
A. Excessive heat
B. Corrosion
,C. Improper water treatment
D. All of the above
Rationale: Tube failure is usually due to overheating, corrosion,
or scaling caused by poor water treatment.
Correct Answer: D
7. Which instrument measures boiler pressure?
A. Thermometer
B. Pressure gauge
C. Flow meter
D. Hygrometer
Rationale: A pressure gauge monitors the internal pressure of
the boiler to ensure safe operation.
Correct Answer: B
8. Why is blowdown performed on a boiler?
A. To increase steam production
B. To remove sediment and impurities
C. To reduce fuel consumption
D. To control pressure
Rationale: Blowdown removes concentrated impurities and
prevents scale and corrosion inside the boiler.
Correct Answer: B
9. What is the purpose of a steam trap?
A. To release non-condensable gases
B. To remove condensate without losing steam
, C. To increase boiler pressure
D. To measure steam flow
Rationale: Steam traps remove condensate while preventing
live steam from escaping.
Correct Answer: B
10. Which type of boiler is most commonly used in large
industrial plants?
A. Fire-tube boiler
B. Water-tube boiler
C. Electric boiler
D. Packaged boiler
Rationale: Water-tube boilers are preferred for large-scale
operations due to high pressure and efficiency.
Correct Answer: B
11. What is the typical operating pressure of a high-pressure
steam boiler?
A. 15–50 psi
B. 100–300 psi
C. 400–600 psi
D. 10–20 psi
Rationale: High-pressure boilers operate at pressures above
100 psi, often up to several hundred psi.
Correct Answer: B
12. What is the main hazard associated with boiler operation?
A. Noise
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a boiler’s safety valve?
A. To increase boiler efficiency
B. To release excess pressure
C. To control fuel consumption
D. To measure water level
Rationale: Safety valves prevent pressure from exceeding safe
limits, protecting the boiler and personnel.
Correct Answer: B
2. Which type of fuel is commonly used in large stationary
boilers?
A. Diesel
B. Natural Gas
C. Coal
D. All of the above
Rationale: Boilers can operate on various fuels depending on
design, with diesel, natural gas, and coal being common.
Correct Answer: D
3. What is the purpose of a deaerator in a boiler system?
A. To heat feedwater
B. To remove dissolved gases
,C. To increase steam pressure
D. To circulate water
Rationale: A deaerator removes oxygen and carbon dioxide to
prevent corrosion in the boiler system.
Correct Answer: B
4. What does “superheated steam” refer to?
A. Steam at 212°F
B. Steam above boiling point without water droplets
C. Steam saturated with water
D. Condensed steam
Rationale: Superheated steam is heated beyond its boiling
point and contains no water droplets, improving energy
transfer.
Correct Answer: B
5. What is the function of a feedwater pump?
A. To generate steam
B. To circulate condensate
C. To supply water to the boiler
D. To control pressure
Rationale: Feedwater pumps ensure continuous water supply
to maintain boiler water levels.
Correct Answer: C
6. What is the main cause of boiler tube failure?
A. Excessive heat
B. Corrosion
,C. Improper water treatment
D. All of the above
Rationale: Tube failure is usually due to overheating, corrosion,
or scaling caused by poor water treatment.
Correct Answer: D
7. Which instrument measures boiler pressure?
A. Thermometer
B. Pressure gauge
C. Flow meter
D. Hygrometer
Rationale: A pressure gauge monitors the internal pressure of
the boiler to ensure safe operation.
Correct Answer: B
8. Why is blowdown performed on a boiler?
A. To increase steam production
B. To remove sediment and impurities
C. To reduce fuel consumption
D. To control pressure
Rationale: Blowdown removes concentrated impurities and
prevents scale and corrosion inside the boiler.
Correct Answer: B
9. What is the purpose of a steam trap?
A. To release non-condensable gases
B. To remove condensate without losing steam
, C. To increase boiler pressure
D. To measure steam flow
Rationale: Steam traps remove condensate while preventing
live steam from escaping.
Correct Answer: B
10. Which type of boiler is most commonly used in large
industrial plants?
A. Fire-tube boiler
B. Water-tube boiler
C. Electric boiler
D. Packaged boiler
Rationale: Water-tube boilers are preferred for large-scale
operations due to high pressure and efficiency.
Correct Answer: B
11. What is the typical operating pressure of a high-pressure
steam boiler?
A. 15–50 psi
B. 100–300 psi
C. 400–600 psi
D. 10–20 psi
Rationale: High-pressure boilers operate at pressures above
100 psi, often up to several hundred psi.
Correct Answer: B
12. What is the main hazard associated with boiler operation?
A. Noise
