Stationary Engineer Electric Exam:
Authoritative 2024/2025 Study Resource
with Verified Questions and Correct,
Fully Explained Answers
•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. - Answer: 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.
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. - Answer: 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. - Answer: 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.
C. Checking the water level using the try cocks valves when the line to
the glass gauge tube is clogged.
D. Opening the water column blowdown valve every day. - Answer: A.
Adding water to an operating boiler when the water level cannot be seen
in the gauge glass tube.
•Which of the following is best if a low-pressure boiler does not have an
air vent?
A. Vent the boiler with the try cocks.
B. Vent the boiler with the safety valve.
C. Vent the boiler with the fusible plug.
, D. Vent the boiler with the blowdown line. - Answer: A. Vent the boiler
with the try cocks.
•What is the purpose of an evaporation test on a low pressure boiler?
A. To test the water column
B. To test the bottom blowdown valve
C. To test the steam pressure safety valve
D. To test the low water cutoff control. - Answer: D. To test the low
water cutoff control.
•Following flame failure, controls must de-energize fuel and ignition
circuits
A. within 4 seconds.
B. within 6 seconds.
C. within 10 seconds.
D. within 15 seconds. - Answer: A. within 4 seconds.
•How can an operator prevent damage to the tubes while using a cleaner
to remove scale from boiler tubes?
A. Never use a chemical cleaning procedure.
B. Never use cleaning water under pressure.
C. Never allow the cleaner to stay in one place.
Authoritative 2024/2025 Study Resource
with Verified Questions and Correct,
Fully Explained Answers
•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. - Answer: 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.
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. - Answer: 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. - Answer: 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.
C. Checking the water level using the try cocks valves when the line to
the glass gauge tube is clogged.
D. Opening the water column blowdown valve every day. - Answer: A.
Adding water to an operating boiler when the water level cannot be seen
in the gauge glass tube.
•Which of the following is best if a low-pressure boiler does not have an
air vent?
A. Vent the boiler with the try cocks.
B. Vent the boiler with the safety valve.
C. Vent the boiler with the fusible plug.
, D. Vent the boiler with the blowdown line. - Answer: A. Vent the boiler
with the try cocks.
•What is the purpose of an evaporation test on a low pressure boiler?
A. To test the water column
B. To test the bottom blowdown valve
C. To test the steam pressure safety valve
D. To test the low water cutoff control. - Answer: D. To test the low
water cutoff control.
•Following flame failure, controls must de-energize fuel and ignition
circuits
A. within 4 seconds.
B. within 6 seconds.
C. within 10 seconds.
D. within 15 seconds. - Answer: A. within 4 seconds.
•How can an operator prevent damage to the tubes while using a cleaner
to remove scale from boiler tubes?
A. Never use a chemical cleaning procedure.
B. Never use cleaning water under pressure.
C. Never allow the cleaner to stay in one place.
