MN
MN BOILER LICENSE EXAM QUESTIONS
AND ANSWERS UPDATED (2024/2025)
(VERIFIED ANSWERS)
What is a fyrite used for?
A) flue gas analyzer
B) combustion programmer
C) water analysis - ANS ✓a) flue gas analyzer
Absolute pressure is (ABS):
A) atmospheric pressure - gauge pressure
B) gauge pressure minus atmospheric pressure
C) atmospheric pressure + gauge pressure - ANS ✓c) atmospheric pressure +
gauge pressure
When pressure of steam increases, what happens to the temperature?
A) Goes up
B) goes down
C) remains the same - ANS ✓a) Goes up
Find the square feet of heating surface of a flu 4" in diameter and 20' in
length:
A) 25'sq
B) 251.32'sq
C) 2513'sq
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MN BOILER
,MN
D) 20.93'sq - ANS ✓d) 20.93'sq
What is the minimum size of the pipes connecting the boiler to the water
column?
A) 3/4 inch
B) 1 inch
C) 1/2 inch - ANS ✓a) 3/4 inch
Why are crosses used instead of ells on water column connections?
A) Cost less
B) has more strength
C) line may be easily cleaned - ANS ✓c) line may be easily cleaned
Can you have valves between boiler and water column?
A) Yes, if they are locked or sealed open
B) no, they might be closed accidentally
C) only if the boiler is under 100 horsepower - ANS ✓a) Yes, if they are locked
or sealed open
Can you have valves between boiler and water column?
A) Yes, if they are locked or sealed open
B) no, they might be closed accidentally
C) only if the boiler is under 100 horsepower - ANS ✓a) Yes, if they are locked
or sealed open
In the HRT boiler, the fuse plug is located in the rear head, _____ inches
above the top row of tubes.
A) 2"
B) 1/2"
2
MN BOILER
,MN
C) 1" - ANS ✓a) 2"
A siphon coil (pigtail) is employed in steam gauge line protects the :
A) Bourdon tube
B) piping
C) draft gauge - ANS ✓a) Bourdon tube
What type of shut off would be preferable on a pressure gauge valve that is
not used
A) non-return
B) needle-type
C) cock with a T or lever-type handle - ANS ✓c) cock with a T or lever-type
handle
Steam gauges shall have a dial graduation of at least:
A) 1 1/2 times the M.A.W.P.
B) same pressure as the boilers
C) 2.0 times the M.A.W.P. - ANS ✓a) 1 1/2 times the M.A.W.P.
What is the function of a feed water regulator?
A) controls temperature of water
B) control solids in the water of boiler
C) control water level in a boiler - ANS ✓c) control water level in a boiler
When two stop valves are used on a steam outlet line, it is good practice to
have one valve :
A) slow opening
B) automatic non-return
C) quick opening - ANS ✓b) automatic non-return
3
MN BOILER
, MN
Is the valve stem connected to the disc on an automatic non-return valve?
A) no
B) yes
C) only when open - ANS ✓a) no
What must you have between two stop valves on the steam outlet and
between the header line?
A) thermocoupler
B) dial actuated thermostat
C) drain - ANS ✓c) drain
On a globe valve used on feed piping, the inlet shall be:
A) immaterial
B) above the valve disc
C) under the valve disc - ANS ✓c) under the valve disc
Which valve offers very little resistance to a flow?
A) gate
B) globe
C) check - ANS ✓a) gate
Which valve is used where a flow in one direction only is desired?
A) gate
B) globe
C) check - ANS ✓c) check
Each boiler shall have:
4
MN BOILER
MN BOILER LICENSE EXAM QUESTIONS
AND ANSWERS UPDATED (2024/2025)
(VERIFIED ANSWERS)
What is a fyrite used for?
A) flue gas analyzer
B) combustion programmer
C) water analysis - ANS ✓a) flue gas analyzer
Absolute pressure is (ABS):
A) atmospheric pressure - gauge pressure
B) gauge pressure minus atmospheric pressure
C) atmospheric pressure + gauge pressure - ANS ✓c) atmospheric pressure +
gauge pressure
When pressure of steam increases, what happens to the temperature?
A) Goes up
B) goes down
C) remains the same - ANS ✓a) Goes up
Find the square feet of heating surface of a flu 4" in diameter and 20' in
length:
A) 25'sq
B) 251.32'sq
C) 2513'sq
1
MN BOILER
,MN
D) 20.93'sq - ANS ✓d) 20.93'sq
What is the minimum size of the pipes connecting the boiler to the water
column?
A) 3/4 inch
B) 1 inch
C) 1/2 inch - ANS ✓a) 3/4 inch
Why are crosses used instead of ells on water column connections?
A) Cost less
B) has more strength
C) line may be easily cleaned - ANS ✓c) line may be easily cleaned
Can you have valves between boiler and water column?
A) Yes, if they are locked or sealed open
B) no, they might be closed accidentally
C) only if the boiler is under 100 horsepower - ANS ✓a) Yes, if they are locked
or sealed open
Can you have valves between boiler and water column?
A) Yes, if they are locked or sealed open
B) no, they might be closed accidentally
C) only if the boiler is under 100 horsepower - ANS ✓a) Yes, if they are locked
or sealed open
In the HRT boiler, the fuse plug is located in the rear head, _____ inches
above the top row of tubes.
A) 2"
B) 1/2"
2
MN BOILER
,MN
C) 1" - ANS ✓a) 2"
A siphon coil (pigtail) is employed in steam gauge line protects the :
A) Bourdon tube
B) piping
C) draft gauge - ANS ✓a) Bourdon tube
What type of shut off would be preferable on a pressure gauge valve that is
not used
A) non-return
B) needle-type
C) cock with a T or lever-type handle - ANS ✓c) cock with a T or lever-type
handle
Steam gauges shall have a dial graduation of at least:
A) 1 1/2 times the M.A.W.P.
B) same pressure as the boilers
C) 2.0 times the M.A.W.P. - ANS ✓a) 1 1/2 times the M.A.W.P.
What is the function of a feed water regulator?
A) controls temperature of water
B) control solids in the water of boiler
C) control water level in a boiler - ANS ✓c) control water level in a boiler
When two stop valves are used on a steam outlet line, it is good practice to
have one valve :
A) slow opening
B) automatic non-return
C) quick opening - ANS ✓b) automatic non-return
3
MN BOILER
, MN
Is the valve stem connected to the disc on an automatic non-return valve?
A) no
B) yes
C) only when open - ANS ✓a) no
What must you have between two stop valves on the steam outlet and
between the header line?
A) thermocoupler
B) dial actuated thermostat
C) drain - ANS ✓c) drain
On a globe valve used on feed piping, the inlet shall be:
A) immaterial
B) above the valve disc
C) under the valve disc - ANS ✓c) under the valve disc
Which valve offers very little resistance to a flow?
A) gate
B) globe
C) check - ANS ✓a) gate
Which valve is used where a flow in one direction only is desired?
A) gate
B) globe
C) check - ANS ✓c) check
Each boiler shall have:
4
MN BOILER
