STATIONARY ENGINEER FINAL ACTUAL
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ _______ draft is a combination of forced and induced draft.
Answer: Combination
◍ When a furnace baffle breaks the gasses short circuit causing excessive
______________..
Answer: fluegas temps
◍ 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..
Answer: A. above 15 psi and over 6 boiler horsepower.
◍ The hardgrove index is a measurement of___________..
Answer: Grindability
◍ ______ is hard coal with a high fixed carbon content..
Answer: Anthracite
◍ This part of the safety valve works in conjunction with the adjusting ring to
allow it to pop open..
Answer: Huddling Chamber
◍ A saybolt universal is a.
Answer: measurement of viscosity
◍ What are the 3 types of coal.
Answer: lignite, bituminous, and anthracite
,◍ Tubes exposed to the highest temps in the furnace and contain rising water
are?.
Answer: riser tubes
◍ To internally remove oxygen from the boiler use______ ________ ..
Answer: Sodium Sulfite
◍ Slow opening blowdown valves must complete ___turns between full open
and full shut..
Answer: 5
◍ 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.
◍ Thermostatic type steam traps are used on ____________.
Answer: radiators
◍ 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.
◍ If multiple safeties are on a boiler- the range of their settings should be
_____.
, Answer: 10%
◍ Condensate system has ________ vent on top. Condensate is treated to get
rid of ____________..
Answer: atmospheric. carbonic acid.
◍ If certain grades of fuel oil are not preheated properly, they may cause
A. higher temperatures in the furnace.
B. back pressure and leaks in the fuel lines.
C. poor combustion and high fuel consumption.
D. increased pressure and dangerous levels of steam..
Answer: C. poor combustion and high fuel consumption.
◍ The air we breathe is made up of roughly ____ oxygen.
Answer: 20%
◍ Oily rags should be stored/disposed properly to prevent spontaneous.
Answer: combustion
◍ Steam traps increase efficiency by removing ___________ and __________
from the system.
Answer: air and condensate
◍ The feedwater regulating valve has a _________ line to get rid of
sludge/sediment.
Answer: blowdown
◍ The rotary cup is a popular way to _____ fuel oil.
Answer: atomize
◍ Coal is rated by its rank and grade. _______ is the degree of hardness of the
coal and _____ is the size of the coal..
Answer: Rank, grade
◍ Which byproduct has the highest heating valve?.
Answer: Butane
◍ Failure to _____ with fresh air can result in a furnace explosion..
Answer: pre-purge
, ◍ What are the gauges on a steam boiler?.
Answer: Pressure gauge and gauge glass
◍ Safety relief valves are repaired to what rules..
Answer: NB rules.
◍ ______ has a low heating value and is not often used as a boiler fuel..
Answer: Lignite
◍ 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.
◍ What is the recommended time for complete external inspection of a boiler?.
Answer: Once a shift
◍ Hideout in a boiler causes what to precipitate?.
Answer: Sodium phosphate
◍ If more steam pressure is needed, increase _____ and _____..
Answer: fuel and air
◍ Horizontal split case centrifugal pump- center eye of impeller is ________
suction pressure. _________ is the formation and collapse of vapor bubbles
which will cause vibration and noise. Caused by __________ water temp or
low pressure. Vibration causes damage..
Answer: Lowest, Cavitation, high
◍ When boiler pressure exceeds _____psi; two blowdown valves must be
used; one must be a slow opening valve.
Answer: 100
◍ Pressure gauges should never have a range less than
A. half the safety valve set pressure.
B. double the safety valve set pressure.
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ _______ draft is a combination of forced and induced draft.
Answer: Combination
◍ When a furnace baffle breaks the gasses short circuit causing excessive
______________..
Answer: fluegas temps
◍ 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..
Answer: A. above 15 psi and over 6 boiler horsepower.
◍ The hardgrove index is a measurement of___________..
Answer: Grindability
◍ ______ is hard coal with a high fixed carbon content..
Answer: Anthracite
◍ This part of the safety valve works in conjunction with the adjusting ring to
allow it to pop open..
Answer: Huddling Chamber
◍ A saybolt universal is a.
Answer: measurement of viscosity
◍ What are the 3 types of coal.
Answer: lignite, bituminous, and anthracite
,◍ Tubes exposed to the highest temps in the furnace and contain rising water
are?.
Answer: riser tubes
◍ To internally remove oxygen from the boiler use______ ________ ..
Answer: Sodium Sulfite
◍ Slow opening blowdown valves must complete ___turns between full open
and full shut..
Answer: 5
◍ 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.
◍ Thermostatic type steam traps are used on ____________.
Answer: radiators
◍ 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.
◍ If multiple safeties are on a boiler- the range of their settings should be
_____.
, Answer: 10%
◍ Condensate system has ________ vent on top. Condensate is treated to get
rid of ____________..
Answer: atmospheric. carbonic acid.
◍ If certain grades of fuel oil are not preheated properly, they may cause
A. higher temperatures in the furnace.
B. back pressure and leaks in the fuel lines.
C. poor combustion and high fuel consumption.
D. increased pressure and dangerous levels of steam..
Answer: C. poor combustion and high fuel consumption.
◍ The air we breathe is made up of roughly ____ oxygen.
Answer: 20%
◍ Oily rags should be stored/disposed properly to prevent spontaneous.
Answer: combustion
◍ Steam traps increase efficiency by removing ___________ and __________
from the system.
Answer: air and condensate
◍ The feedwater regulating valve has a _________ line to get rid of
sludge/sediment.
Answer: blowdown
◍ The rotary cup is a popular way to _____ fuel oil.
Answer: atomize
◍ Coal is rated by its rank and grade. _______ is the degree of hardness of the
coal and _____ is the size of the coal..
Answer: Rank, grade
◍ Which byproduct has the highest heating valve?.
Answer: Butane
◍ Failure to _____ with fresh air can result in a furnace explosion..
Answer: pre-purge
, ◍ What are the gauges on a steam boiler?.
Answer: Pressure gauge and gauge glass
◍ Safety relief valves are repaired to what rules..
Answer: NB rules.
◍ ______ has a low heating value and is not often used as a boiler fuel..
Answer: Lignite
◍ 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.
◍ What is the recommended time for complete external inspection of a boiler?.
Answer: Once a shift
◍ Hideout in a boiler causes what to precipitate?.
Answer: Sodium phosphate
◍ If more steam pressure is needed, increase _____ and _____..
Answer: fuel and air
◍ Horizontal split case centrifugal pump- center eye of impeller is ________
suction pressure. _________ is the formation and collapse of vapor bubbles
which will cause vibration and noise. Caused by __________ water temp or
low pressure. Vibration causes damage..
Answer: Lowest, Cavitation, high
◍ When boiler pressure exceeds _____psi; two blowdown valves must be
used; one must be a slow opening valve.
Answer: 100
◍ Pressure gauges should never have a range less than
A. half the safety valve set pressure.
B. double the safety valve set pressure.
