1 | Page
Stationary Engineer Exam Questions and
Correct Answers
High pressure steam boilers generally operate at pressures
A. above 15 psi and over 6 boiler horsepower.
B. below 15 psi and over 8 boiler horsepower.
C. above 250 psi and over 6 boiler horsepower.
D. at 212 psi and over 8 boiler horsepower. Ans: A. above 15 psi
and over 6 boiler horsepower.
Pressure gauges should never have a range less than
A. half the safety valve set pressure.
B. double the safety valve set pressure.
C. 3/4 times the safety valve set pressure.
D. 1 1/2 times the safety valve set pressure. Ans: D. 1 1/2 times
the safety valve set pressure.
After water is blown out of a siphon, why should live steam never
be allowed to enter a Bourdon tube?
A. The steam will rupture the siphon tube.
© 2025 All rights reserved
, 2 | Page
B. Combustion gases will mix with the steam.
C. Live steam will damage the pressure gauge.
D. The water level gauge will be damaged or destroyed. Ans: C.
Live steam will damage the pressure gauge.
All of the following are essential to maintain the proper fuel oil
pressure with fuel oil accessories EXCEPT
A. achieving the right flow of fuel.
B. proper atomization of the fuel oil.
C. heating fuel oil to the correct temperature.
D. obtaining the correct difference in pressure inside and outside
the boiler. Ans: D. obtaining the correct difference in pressure
inside and outside the boiler.
Which of the following could be dangerous to safe operation of a
low pressure boiler?
A. Adding water to an operating boiler when the water level cannot
be seen in the gauge glass tube.
B. Opening the blowdown valve at the bottom of the water gauge
glass before making a water level reading.
© 2025 All rights reserved
Stationary Engineer Exam Questions and
Correct Answers
High pressure steam boilers generally operate at pressures
A. above 15 psi and over 6 boiler horsepower.
B. below 15 psi and over 8 boiler horsepower.
C. above 250 psi and over 6 boiler horsepower.
D. at 212 psi and over 8 boiler horsepower. Ans: A. above 15 psi
and over 6 boiler horsepower.
Pressure gauges should never have a range less than
A. half the safety valve set pressure.
B. double the safety valve set pressure.
C. 3/4 times the safety valve set pressure.
D. 1 1/2 times the safety valve set pressure. Ans: D. 1 1/2 times
the safety valve set pressure.
After water is blown out of a siphon, why should live steam never
be allowed to enter a Bourdon tube?
A. The steam will rupture the siphon tube.
© 2025 All rights reserved
, 2 | Page
B. Combustion gases will mix with the steam.
C. Live steam will damage the pressure gauge.
D. The water level gauge will be damaged or destroyed. Ans: C.
Live steam will damage the pressure gauge.
All of the following are essential to maintain the proper fuel oil
pressure with fuel oil accessories EXCEPT
A. achieving the right flow of fuel.
B. proper atomization of the fuel oil.
C. heating fuel oil to the correct temperature.
D. obtaining the correct difference in pressure inside and outside
the boiler. Ans: D. obtaining the correct difference in pressure
inside and outside the boiler.
Which of the following could be dangerous to safe operation of a
low pressure boiler?
A. Adding water to an operating boiler when the water level cannot
be seen in the gauge glass tube.
B. Opening the blowdown valve at the bottom of the water gauge
glass before making a water level reading.
© 2025 All rights reserved
