MINNESOTA SPECIAL ENGINEER
BOILER LICENSE PRACTICE EXAM
2025 QUESTIONS AND ANSWERS
For the purpose of rating boiler horsepower for an Engineers License only, how many square
feet of boiler surface shall be equivalent to one boiler horsepower on a boiler? - ANS 10 Sq.
Ft. Heating Surface
What is meant by the term "Low Pressure Boiler"? - ANS Boilers operating at a steam or
other vapor pressure of 15psig or less, or a hot water or other liquid boiler in which the
pressure does not exceed 160 psig or a temperature of 250 degrees F.
A person holding a current State of Minnesota Special Engineers License could be in charge of,
or a shift engineer in what size plant(s)? - ANS High and Low pressure boilers not to exceed a
total of 50 boiler horsepower, or a shift engineer in a 100 horsepower plant.
Special Engineer may serve as an apprentice of what size water/liquid or steam/vapor boiler? -
ANS In any plant regardless of size under the direct supervision of a properly licensed
engineer.
The purpose of low water cut out on a steam or hot water boiler is to what? - ANS Shut off
the burner when a low water condition exists.
The valve or valves that must relieve all excess pressure on a steam or hot water boiler are
what? - ANS Safety valve and/or an ASME approved safety relief valve.
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, A Tri indicator could be found on a: - ANS Hot water boiler
A tri indicator would inform the boiler operator of what? - ANS The TEMPERATURE of the
water, the PRESSURE of the water in PSIG, and the ALTITUDE of water in feet.
What is the destructive force in a steam or hot water boiler explosion? - ANS The instant
release of energy stored in the water as heat.
An ASME approved safety relieve calve used on a hot water boiler is tested at the factory on
what? - ANS Steam first then hot water.
Some of the things you could find on a steam boiler (or hot water boiler) are what? -
ANS Low water cut off, safety valve or safety relief valve, pressure gauge.
What devices would only be found on a steam boiler? - ANS Steam pressure gauge, tricocks,
Pressuretrols
An expansion tank or compression tank would be used in what? - ANS Hot water boiler
What is the purpose of the expansion tank? - ANS To provide for expansion and contraction
of the water volume as its temperature varies.
On a hot water boiler, what is the purpose of the vent valve? - ANS To make sure there is
water inside the boiler and to vent any trapped air.
If the safety valve or ASME safety relief valve leaks you would do what? - ANS Have the valve
repaired or replaced.
Copyright ©2025 THEBRIGHT ALL RIGHTS RESERVED 2
BOILER LICENSE PRACTICE EXAM
2025 QUESTIONS AND ANSWERS
For the purpose of rating boiler horsepower for an Engineers License only, how many square
feet of boiler surface shall be equivalent to one boiler horsepower on a boiler? - ANS 10 Sq.
Ft. Heating Surface
What is meant by the term "Low Pressure Boiler"? - ANS Boilers operating at a steam or
other vapor pressure of 15psig or less, or a hot water or other liquid boiler in which the
pressure does not exceed 160 psig or a temperature of 250 degrees F.
A person holding a current State of Minnesota Special Engineers License could be in charge of,
or a shift engineer in what size plant(s)? - ANS High and Low pressure boilers not to exceed a
total of 50 boiler horsepower, or a shift engineer in a 100 horsepower plant.
Special Engineer may serve as an apprentice of what size water/liquid or steam/vapor boiler? -
ANS In any plant regardless of size under the direct supervision of a properly licensed
engineer.
The purpose of low water cut out on a steam or hot water boiler is to what? - ANS Shut off
the burner when a low water condition exists.
The valve or valves that must relieve all excess pressure on a steam or hot water boiler are
what? - ANS Safety valve and/or an ASME approved safety relief valve.
Copyright ©2025 THEBRIGHT ALL RIGHTS RESERVED 1
, A Tri indicator could be found on a: - ANS Hot water boiler
A tri indicator would inform the boiler operator of what? - ANS The TEMPERATURE of the
water, the PRESSURE of the water in PSIG, and the ALTITUDE of water in feet.
What is the destructive force in a steam or hot water boiler explosion? - ANS The instant
release of energy stored in the water as heat.
An ASME approved safety relieve calve used on a hot water boiler is tested at the factory on
what? - ANS Steam first then hot water.
Some of the things you could find on a steam boiler (or hot water boiler) are what? -
ANS Low water cut off, safety valve or safety relief valve, pressure gauge.
What devices would only be found on a steam boiler? - ANS Steam pressure gauge, tricocks,
Pressuretrols
An expansion tank or compression tank would be used in what? - ANS Hot water boiler
What is the purpose of the expansion tank? - ANS To provide for expansion and contraction
of the water volume as its temperature varies.
On a hot water boiler, what is the purpose of the vent valve? - ANS To make sure there is
water inside the boiler and to vent any trapped air.
If the safety valve or ASME safety relief valve leaks you would do what? - ANS Have the valve
repaired or replaced.
Copyright ©2025 THEBRIGHT ALL RIGHTS RESERVED 2
