1st Class Stationary Engineer License
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 boiler pressure
B. Maintain constant temperature
C. Prevent overpressure
D. Regulate fuel flow
The safety valve is designed to release excess pressure and
prevent boiler explosions.
2. In a fire-tube boiler, where does the heat from the combustion
gases primarily transfer?
A. Water in the shell
B. Tubes containing water
C. External insulation
D. Chimney
In fire-tube boilers, combustion gases pass through tubes
surrounded by water, transferring heat to the water.
3. Which of the following indicates that a pump is cavitating?
A. Reduced vibration
, B. Noise like marbles in the pump
C. Increased flow
D. Constant pressure
Cavitation occurs when vapor bubbles form and collapse inside a
pump, creating a characteristic noise.
4. What is the main function of a feedwater economizer?
A. Reduce boiler pressure
B. Increase combustion efficiency
C. Preheat feedwater
D. Remove sludge
Preheating feedwater with exhaust gases improves overall boiler
efficiency.
5. Which gas is commonly measured to determine combustion
efficiency?
A. Oxygen
B. Carbon dioxide (CO2)
C. Nitrogen
D. Helium
CO2 levels indicate how completely fuel is being burned; higher
CO2 generally means better efficiency.
6. Which type of pump is best for high-pressure, low-flow
applications?
A. Centrifugal
B. Positive displacement
C. Axial flow
D. Propeller
Positive displacement pumps deliver a fixed volume per
revolution, making them ideal for high-pressure, low-flow
situations.
, 7. What is the primary cause of boiler water carryover?
A. Excess fuel
B. High water level or impurities
C. Low combustion efficiency
D. Closed blowdown valve
Carryover occurs when water droplets are carried with steam
due to high levels or dissolved solids.
8. Which of the following devices is used to measure boiler water
level?
A. Pressure gauge
B. Thermocouple
C. Sight glass
D. Flow meter
A sight glass allows direct visual monitoring of the water level
inside a boiler.
9. What is the most important reason to remove oxygen from boiler
feedwater?
A. Increase pressure
B. Prevent corrosion
C. Reduce scale
D. Improve combustion
Dissolved oxygen in water causes internal corrosion in boilers.
10. What is the effect of superheating steam?
A. Decreases pressure
B. Increases thermal energy
C. Reduces flow velocity
D. Decreases volume
Superheated steam carries more energy and is used in turbines
to prevent condensation.
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 boiler pressure
B. Maintain constant temperature
C. Prevent overpressure
D. Regulate fuel flow
The safety valve is designed to release excess pressure and
prevent boiler explosions.
2. In a fire-tube boiler, where does the heat from the combustion
gases primarily transfer?
A. Water in the shell
B. Tubes containing water
C. External insulation
D. Chimney
In fire-tube boilers, combustion gases pass through tubes
surrounded by water, transferring heat to the water.
3. Which of the following indicates that a pump is cavitating?
A. Reduced vibration
, B. Noise like marbles in the pump
C. Increased flow
D. Constant pressure
Cavitation occurs when vapor bubbles form and collapse inside a
pump, creating a characteristic noise.
4. What is the main function of a feedwater economizer?
A. Reduce boiler pressure
B. Increase combustion efficiency
C. Preheat feedwater
D. Remove sludge
Preheating feedwater with exhaust gases improves overall boiler
efficiency.
5. Which gas is commonly measured to determine combustion
efficiency?
A. Oxygen
B. Carbon dioxide (CO2)
C. Nitrogen
D. Helium
CO2 levels indicate how completely fuel is being burned; higher
CO2 generally means better efficiency.
6. Which type of pump is best for high-pressure, low-flow
applications?
A. Centrifugal
B. Positive displacement
C. Axial flow
D. Propeller
Positive displacement pumps deliver a fixed volume per
revolution, making them ideal for high-pressure, low-flow
situations.
, 7. What is the primary cause of boiler water carryover?
A. Excess fuel
B. High water level or impurities
C. Low combustion efficiency
D. Closed blowdown valve
Carryover occurs when water droplets are carried with steam
due to high levels or dissolved solids.
8. Which of the following devices is used to measure boiler water
level?
A. Pressure gauge
B. Thermocouple
C. Sight glass
D. Flow meter
A sight glass allows direct visual monitoring of the water level
inside a boiler.
9. What is the most important reason to remove oxygen from boiler
feedwater?
A. Increase pressure
B. Prevent corrosion
C. Reduce scale
D. Improve combustion
Dissolved oxygen in water causes internal corrosion in boilers.
10. What is the effect of superheating steam?
A. Decreases pressure
B. Increases thermal energy
C. Reduces flow velocity
D. Decreases volume
Superheated steam carries more energy and is used in turbines
to prevent condensation.
