Stationary Engineer Boiler Exam Newest 2026
Questions and Correct Detailed Answers Already
Graded A+
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.
D. Never clean the tubes more often than every six months. - CORRECT
ANSWER-C. Never allow the cleaner to stay in one place.
In a steam boiler, which of the following should never be placed between the
safety relief valve and the boiler?
A. A steam trap
B. A shut-off valve
C. An air eliminator
D. A discharge pipe - CORRECT ANSWER-B. A shut-off valve
Which of these should be used on live electrical fires?
,A. Class D extinguishers
B. Class C extinguishers
C. Class B extinguishers
D. Class A extinguishers - CORRECT ANSWER-B. Class C extinguishers
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. - CORRECT 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. - CORRECT 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. -
CORRECT 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. - CORRECT ANSWER-
A. Adding water to an operating boiler when the water level cannot be seen in the
gauge glass tube.
Questions and Correct Detailed Answers Already
Graded A+
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.
D. Never clean the tubes more often than every six months. - CORRECT
ANSWER-C. Never allow the cleaner to stay in one place.
In a steam boiler, which of the following should never be placed between the
safety relief valve and the boiler?
A. A steam trap
B. A shut-off valve
C. An air eliminator
D. A discharge pipe - CORRECT ANSWER-B. A shut-off valve
Which of these should be used on live electrical fires?
,A. Class D extinguishers
B. Class C extinguishers
C. Class B extinguishers
D. Class A extinguishers - CORRECT ANSWER-B. Class C extinguishers
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. - CORRECT 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. - CORRECT 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. -
CORRECT 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. - CORRECT ANSWER-
A. Adding water to an operating boiler when the water level cannot be seen in the
gauge glass tube.
