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NYC Health + Hospitals Senior Power
Plant Operator Examination Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Exam Prep & Study Guide
1. What is the primary purpose of a boiler safety valve?
A. To regulate feedwater temperature
B. To prevent excessive boiler pressure
C. To increase steam pressure
D. To control combustion air
Answer: To prevent excessive boiler pressure
Rationale: A safety valve automatically releases steam when pressure exceeds
its set limit, protecting the boiler and personnel from dangerous overpressure.
2. What is the primary function of boiler feedwater?
A. To cool the burner
B. To supply water that will be converted into steam
C. To lubricate the boiler tubes
D. To remove combustion gases
Answer: To supply water that will be converted into steam
,Rationale: Feedwater replaces water converted to steam and maintains the
proper boiler water level during operation.
3. Why is boiler water treated?
A. To increase fuel consumption
B. To eliminate the need for blowdown
C. To control scale, corrosion, and impurities
D. To increase flue-gas temperature
Answer: To control scale, corrosion, and impurities
Rationale: Proper water treatment protects boiler surfaces from scale and
corrosion and helps maintain efficient, reliable operation.
4. What is the purpose of a low-water cutoff on a steam boiler?
A. To increase steam pressure
B. To shut down the burner when water level becomes dangerously low
C. To increase combustion air
D. To regulate condensate temperature
Answer: To shut down the burner when water level becomes dangerously low
Rationale: Exposing boiler heating surfaces because of low water can cause
severe overheating and equipment failure.
5. What is the main purpose of boiler blowdown?
A. To increase boiler water concentration
B. To remove accumulated dissolved solids and sludge
C. To increase steam temperature
D. To increase burner firing rate
Answer: To remove accumulated dissolved solids and sludge
Rationale: Blowdown removes impurities and concentrated solids from boiler
water, helping maintain proper water chemistry and steam quality.
, 6. What does a boiler burner primarily provide?
A. Electrical power
B. Heat energy for transferring energy to the boiler water
C. Cooling water
D. Condensate return
Answer: Heat energy for transferring energy to the boiler water
Rationale: The burner mixes fuel and combustion air and releases heat that is
transferred through the boiler heating surfaces to generate steam.
7. What is the purpose of combustion air in a boiler?
A. To cool the steam drum
B. To provide oxygen necessary for combustion
C. To reduce feedwater pressure
D. To lubricate burner components
Answer: To provide oxygen necessary for combustion
Rationale: Combustion requires oxygen. Proper air supply is essential for safe
and efficient fuel combustion.
8. Excessive oxygen in boiler flue gas generally indicates:
A. Insufficient combustion air
B. Excess combustion air
C. No combustion
D. Excess feedwater
Answer: Excess combustion air
Rationale: Oxygen remaining in flue gas commonly indicates that more
combustion air is being supplied than is required for complete combustion.
9. What is the purpose of a deaerator?
, A. To remove dissolved gases from feedwater
B. To increase boiler scale
C. To cool steam
D. To remove soot from tubes
Answer: To remove dissolved gases from feedwater
Rationale: Deaerators remove oxygen and carbon dioxide from feedwater,
reducing corrosion in boilers, feedwater piping, and related equipment.
10.What is the primary function of a steam trap?
A. To increase steam pressure
B. To remove condensate and noncondensable gases while retaining steam
C. To produce steam
D. To increase boiler water level
Answer: To remove condensate and noncondensable gases while retaining
steam
Rationale: Steam traps automatically discharge condensate and air from steam
systems while minimizing the loss of usable steam.
11.Why is condensate returned to a boiler plant?
A. To waste treated water
B. To recover heat and treated water
C. To increase corrosion
D. To reduce boiler efficiency
Answer: To recover heat and treated water
Rationale: Returning condensate conserves energy, water, and chemical
treatment while reducing the amount of cold makeup water required.
12.What condition can result from water hammer in a steam system?
NYC Health + Hospitals Senior Power
Plant Operator Examination Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Exam Prep & Study Guide
1. What is the primary purpose of a boiler safety valve?
A. To regulate feedwater temperature
B. To prevent excessive boiler pressure
C. To increase steam pressure
D. To control combustion air
Answer: To prevent excessive boiler pressure
Rationale: A safety valve automatically releases steam when pressure exceeds
its set limit, protecting the boiler and personnel from dangerous overpressure.
2. What is the primary function of boiler feedwater?
A. To cool the burner
B. To supply water that will be converted into steam
C. To lubricate the boiler tubes
D. To remove combustion gases
Answer: To supply water that will be converted into steam
,Rationale: Feedwater replaces water converted to steam and maintains the
proper boiler water level during operation.
3. Why is boiler water treated?
A. To increase fuel consumption
B. To eliminate the need for blowdown
C. To control scale, corrosion, and impurities
D. To increase flue-gas temperature
Answer: To control scale, corrosion, and impurities
Rationale: Proper water treatment protects boiler surfaces from scale and
corrosion and helps maintain efficient, reliable operation.
4. What is the purpose of a low-water cutoff on a steam boiler?
A. To increase steam pressure
B. To shut down the burner when water level becomes dangerously low
C. To increase combustion air
D. To regulate condensate temperature
Answer: To shut down the burner when water level becomes dangerously low
Rationale: Exposing boiler heating surfaces because of low water can cause
severe overheating and equipment failure.
5. What is the main purpose of boiler blowdown?
A. To increase boiler water concentration
B. To remove accumulated dissolved solids and sludge
C. To increase steam temperature
D. To increase burner firing rate
Answer: To remove accumulated dissolved solids and sludge
Rationale: Blowdown removes impurities and concentrated solids from boiler
water, helping maintain proper water chemistry and steam quality.
, 6. What does a boiler burner primarily provide?
A. Electrical power
B. Heat energy for transferring energy to the boiler water
C. Cooling water
D. Condensate return
Answer: Heat energy for transferring energy to the boiler water
Rationale: The burner mixes fuel and combustion air and releases heat that is
transferred through the boiler heating surfaces to generate steam.
7. What is the purpose of combustion air in a boiler?
A. To cool the steam drum
B. To provide oxygen necessary for combustion
C. To reduce feedwater pressure
D. To lubricate burner components
Answer: To provide oxygen necessary for combustion
Rationale: Combustion requires oxygen. Proper air supply is essential for safe
and efficient fuel combustion.
8. Excessive oxygen in boiler flue gas generally indicates:
A. Insufficient combustion air
B. Excess combustion air
C. No combustion
D. Excess feedwater
Answer: Excess combustion air
Rationale: Oxygen remaining in flue gas commonly indicates that more
combustion air is being supplied than is required for complete combustion.
9. What is the purpose of a deaerator?
, A. To remove dissolved gases from feedwater
B. To increase boiler scale
C. To cool steam
D. To remove soot from tubes
Answer: To remove dissolved gases from feedwater
Rationale: Deaerators remove oxygen and carbon dioxide from feedwater,
reducing corrosion in boilers, feedwater piping, and related equipment.
10.What is the primary function of a steam trap?
A. To increase steam pressure
B. To remove condensate and noncondensable gases while retaining steam
C. To produce steam
D. To increase boiler water level
Answer: To remove condensate and noncondensable gases while retaining
steam
Rationale: Steam traps automatically discharge condensate and air from steam
systems while minimizing the loss of usable steam.
11.Why is condensate returned to a boiler plant?
A. To waste treated water
B. To recover heat and treated water
C. To increase corrosion
D. To reduce boiler efficiency
Answer: To recover heat and treated water
Rationale: Returning condensate conserves energy, water, and chemical
treatment while reducing the amount of cold makeup water required.
12.What condition can result from water hammer in a steam system?
