Minnesota Special Engineer Boiler License Exam
2025/2026 Study Questions And Answers
Special (License Grade)
Work in any type of plant
Grade C (License Grade)
Can operate low-pressure steam or hot water (no steam engines/turbines)
Grade B (License Grade)
Can operate high-pressure or low-pressure steam or hot water (no steam engines/turbines)
Grade A (License Grade)
Can operate any plant including plants with steam engines/turbines
Special (License Class)
Take Charge (max 50 hpr)
Shift Engineer (max 100 hpr)
,2nd Class (License Class)
Take Charge (max 100 hpr)
Shift Engineer (max 500 hpr)
1st Class (License Class)
Take Charge (max 500 hpr)
Shift Engineer (unlimited hpr)
Chief (License Class)
Take Charge (unlimited hpr)
Shift engineer (unlimited hpr)
Shift Engineer
Can operate and take responsibility for the plant while on duty
Take Charge
You are the main person in charge of the plant. You supervise shift engineers.
1 boiler horsepower =
,= 10 sq. Ft of heating surface
8.3
1 gallon of water weighs _____ pounds
10 kilowatts (for licensing)
_____ kilowatts = 1 horsepower
67,000 BTU/hr (for licensing)
__________ BTU/hr = 1 horsepower
In the boiler room
Where should a boiler license be displayed?
One BTU
What will raise one pound of water by one degree F
Check water level
When entering a steam boiler room what is the first thing an operator should do?
, Above 15 psi, above 160 psi water, and temps above 250°F
A high pressure boiler is classified as such when what - ?
A.S.M.E. Approved
What type of safety valve is required?
Efficiency
When operating a boiler, what is most important?
Shuts off fuel in case of low water
How does a low water fuel cut off (LWCO) protect a boiler?
shut off the burner when a low water condition exists.
If you cannot determine water level what do you do?
No
Can you compress a liquid?
2025/2026 Study Questions And Answers
Special (License Grade)
Work in any type of plant
Grade C (License Grade)
Can operate low-pressure steam or hot water (no steam engines/turbines)
Grade B (License Grade)
Can operate high-pressure or low-pressure steam or hot water (no steam engines/turbines)
Grade A (License Grade)
Can operate any plant including plants with steam engines/turbines
Special (License Class)
Take Charge (max 50 hpr)
Shift Engineer (max 100 hpr)
,2nd Class (License Class)
Take Charge (max 100 hpr)
Shift Engineer (max 500 hpr)
1st Class (License Class)
Take Charge (max 500 hpr)
Shift Engineer (unlimited hpr)
Chief (License Class)
Take Charge (unlimited hpr)
Shift engineer (unlimited hpr)
Shift Engineer
Can operate and take responsibility for the plant while on duty
Take Charge
You are the main person in charge of the plant. You supervise shift engineers.
1 boiler horsepower =
,= 10 sq. Ft of heating surface
8.3
1 gallon of water weighs _____ pounds
10 kilowatts (for licensing)
_____ kilowatts = 1 horsepower
67,000 BTU/hr (for licensing)
__________ BTU/hr = 1 horsepower
In the boiler room
Where should a boiler license be displayed?
One BTU
What will raise one pound of water by one degree F
Check water level
When entering a steam boiler room what is the first thing an operator should do?
, Above 15 psi, above 160 psi water, and temps above 250°F
A high pressure boiler is classified as such when what - ?
A.S.M.E. Approved
What type of safety valve is required?
Efficiency
When operating a boiler, what is most important?
Shuts off fuel in case of low water
How does a low water fuel cut off (LWCO) protect a boiler?
shut off the burner when a low water condition exists.
If you cannot determine water level what do you do?
No
Can you compress a liquid?
