NYC Stationary Engineer Exam With Actual
Questions & Verified Answers, Plus
Explained Rationales/Expert Verified For
Guaranteed 100% Pass 2026/Latest
Update/Instant Download Pdf
1. What is the primary purpose of a boiler’s safety valve?
A) Increase pressure
B) Release excess pressure
C) Reduce fuel consumption
D) Control water level
Rationale: Safety valves protect the boiler from overpressure by
releasing excess steam when pressure exceeds safe limits.
2. Which type of pump is most commonly used for circulating water
in a boiler system?
A) Gear pump
B) Centrifugal pump
C) Piston pump
D) Diaphragm pump
Rationale: Centrifugal pumps are widely used for boiler
circulation due to their efficiency and ability to handle large
volumes of water.
3. What is the main function of a boiler economizer?
A) Increase steam temperature
B) Reduce fuel efficiency
C) Recover heat from flue gases
, D) Feed water into the boiler
Rationale: Economizers capture waste heat from flue gases to
preheat the feed water, improving fuel efficiency.
4. In a steam system, what does a deaerator do?
A) Increase pressure
B) Remove dissolved gases from feed water
C) Reduce steam temperature
D) Filter impurities
Rationale: Deaerators remove oxygen and carbon dioxide to
prevent corrosion in boilers.
5. What is the normal operating pressure range for a low-pressure
steam boiler?
A) 15–30 psi
B) 50–100 psi
C) 15–20 psi
D) 200–250 psi
Rationale: Low-pressure steam boilers typically operate at 15–20
psi to provide safe and efficient steam distribution.
6. What device is used to measure steam pressure in a boiler?
A) Thermometer
B) Flow meter
C) Pressure gauge
D) Level gauge
Rationale: Pressure gauges provide a visual reading of the
boiler’s internal steam pressure.
7. Which type of fuel requires a forced draft blower for combustion?
A) Natural gas
B) Oil
C) Coal
, D) Solar
Rationale: Coal combustion needs a forced draft to supply
sufficient air for complete burning.
8. What is “carryover” in a boiler?
A) Fuel loss
B) Water droplets or impurities carried with steam
C) Steam condensation
D) Heat loss through the stack
Rationale: Carryover can damage turbines and piping by
introducing water and impurities into the steam system.
9. How often should boiler water be tested for chemical
composition?
A) Once a year
B) Once a month
C) Daily or as specified by code
D) Once a week
Rationale: Regular testing prevents scaling, corrosion, and
unsafe operating conditions.
10. Which of the following is a common cause of boiler tube
failure?
A) Overheating
B) Corrosion
C) Excess lubrication
D) Low air supply
Rationale: Corrosion weakens boiler tubes over time, leading to
leaks or ruptures.
11. What is the purpose of a superheater in a steam boiler?
A) Reduce water content
B) Lower pressure
Questions & Verified Answers, Plus
Explained Rationales/Expert Verified For
Guaranteed 100% Pass 2026/Latest
Update/Instant Download Pdf
1. What is the primary purpose of a boiler’s safety valve?
A) Increase pressure
B) Release excess pressure
C) Reduce fuel consumption
D) Control water level
Rationale: Safety valves protect the boiler from overpressure by
releasing excess steam when pressure exceeds safe limits.
2. Which type of pump is most commonly used for circulating water
in a boiler system?
A) Gear pump
B) Centrifugal pump
C) Piston pump
D) Diaphragm pump
Rationale: Centrifugal pumps are widely used for boiler
circulation due to their efficiency and ability to handle large
volumes of water.
3. What is the main function of a boiler economizer?
A) Increase steam temperature
B) Reduce fuel efficiency
C) Recover heat from flue gases
, D) Feed water into the boiler
Rationale: Economizers capture waste heat from flue gases to
preheat the feed water, improving fuel efficiency.
4. In a steam system, what does a deaerator do?
A) Increase pressure
B) Remove dissolved gases from feed water
C) Reduce steam temperature
D) Filter impurities
Rationale: Deaerators remove oxygen and carbon dioxide to
prevent corrosion in boilers.
5. What is the normal operating pressure range for a low-pressure
steam boiler?
A) 15–30 psi
B) 50–100 psi
C) 15–20 psi
D) 200–250 psi
Rationale: Low-pressure steam boilers typically operate at 15–20
psi to provide safe and efficient steam distribution.
6. What device is used to measure steam pressure in a boiler?
A) Thermometer
B) Flow meter
C) Pressure gauge
D) Level gauge
Rationale: Pressure gauges provide a visual reading of the
boiler’s internal steam pressure.
7. Which type of fuel requires a forced draft blower for combustion?
A) Natural gas
B) Oil
C) Coal
, D) Solar
Rationale: Coal combustion needs a forced draft to supply
sufficient air for complete burning.
8. What is “carryover” in a boiler?
A) Fuel loss
B) Water droplets or impurities carried with steam
C) Steam condensation
D) Heat loss through the stack
Rationale: Carryover can damage turbines and piping by
introducing water and impurities into the steam system.
9. How often should boiler water be tested for chemical
composition?
A) Once a year
B) Once a month
C) Daily or as specified by code
D) Once a week
Rationale: Regular testing prevents scaling, corrosion, and
unsafe operating conditions.
10. Which of the following is a common cause of boiler tube
failure?
A) Overheating
B) Corrosion
C) Excess lubrication
D) Low air supply
Rationale: Corrosion weakens boiler tubes over time, leading to
leaks or ruptures.
11. What is the purpose of a superheater in a steam boiler?
A) Reduce water content
B) Lower pressure
