MN BOILERS LICENSE PREP TEST
QUESTIONS AND CORRECT
ANSWERS
Special (License Grade) - ans-Work in any type of plant
Grade C (License Grade) - ans-Can operate low-pressure steam or hot water (no steam
engines/turbines)
Grade B (License Grade) - ans-Can operate high-pressure or low-pressure steam or hot
water (no steam engines/turbines)
Grade A (License Grade) - ans-Can operate any plant including plants with steam
engines/turbines
Special (License Class) - ans-Take Charge (max 50 hpr)
Shift Engineer (max 100 hpr)
2nd Class (License Class) - ans-Take Charge (max 100 hpr)
Shift Engineer (max 500 hpr)
1st Class (License Class) - ans-Take Charge (max 500 hpr)
Shift Engineer (unlimited hpr)
Chief (License Class) - ans-Take Charge (unlimited hpr)
Shift engineer (unlimited hpr)
Shift Engineer - ans-Can operate and take responsibility for the plant while on duty
Take Charge - ans-You are the main person in charge of the plant. You supervise shift
engineers.
1 boiler horsepower = - ans-= 10 sq. Ft of heating surface
8.3 - ans-1 gallon of water weighs _____ pounds
, 10 kilowatts (for licensing) - ans-_____ kilowatts = 1 horsepower
67,000 BTU/hr (for licensing) - ans-__________ BTU/hr = 1 horsepower
In the boiler room - ans-Where should a boiler license be displayed?
One BTU - ans-What will raise one pound of water by one degree F
Check water level - ans-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 - ans-A high pressure
boiler is classified as such when what - ?
A.S.M.E. Approved - ans-What type of safety valve is required?
Efficiency - ans-When operating a boiler, what is most important?
Shuts off fuel in case of low water - ans-How does a low water fuel cut off (LWCO)
protect a boiler?
shut off the burner when a low water condition exists. - ans-If you cannot determine
water level what do you do?
No - ans-Can you compress a liquid?
Cast Iron Sectional and Firebox - ans-What boilers are low pressure only?
Push nipples and Tie Rods - ans-What holds cast iron sections together?
At least as big as the largest incoming wire - ans-On electric boilers, how large should
the ground wire be?
Baffle - ans-Directs flow of combustion gasses, water, and/or steam
Passes - ans-Amount of times the heat moves through the tubes in a fire tube boiler
Refractory - ans-Hard surface insulation (brick, concrete,...)
Stays - ans-Helps keep shape and position of boiler
Tubing - ans-Measured by Outside Diameter (OD)
Package Boiler - ans-Comes completely assembled with its own feedwater pumps, fuel
system & draft fans
QUESTIONS AND CORRECT
ANSWERS
Special (License Grade) - ans-Work in any type of plant
Grade C (License Grade) - ans-Can operate low-pressure steam or hot water (no steam
engines/turbines)
Grade B (License Grade) - ans-Can operate high-pressure or low-pressure steam or hot
water (no steam engines/turbines)
Grade A (License Grade) - ans-Can operate any plant including plants with steam
engines/turbines
Special (License Class) - ans-Take Charge (max 50 hpr)
Shift Engineer (max 100 hpr)
2nd Class (License Class) - ans-Take Charge (max 100 hpr)
Shift Engineer (max 500 hpr)
1st Class (License Class) - ans-Take Charge (max 500 hpr)
Shift Engineer (unlimited hpr)
Chief (License Class) - ans-Take Charge (unlimited hpr)
Shift engineer (unlimited hpr)
Shift Engineer - ans-Can operate and take responsibility for the plant while on duty
Take Charge - ans-You are the main person in charge of the plant. You supervise shift
engineers.
1 boiler horsepower = - ans-= 10 sq. Ft of heating surface
8.3 - ans-1 gallon of water weighs _____ pounds
, 10 kilowatts (for licensing) - ans-_____ kilowatts = 1 horsepower
67,000 BTU/hr (for licensing) - ans-__________ BTU/hr = 1 horsepower
In the boiler room - ans-Where should a boiler license be displayed?
One BTU - ans-What will raise one pound of water by one degree F
Check water level - ans-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 - ans-A high pressure
boiler is classified as such when what - ?
A.S.M.E. Approved - ans-What type of safety valve is required?
Efficiency - ans-When operating a boiler, what is most important?
Shuts off fuel in case of low water - ans-How does a low water fuel cut off (LWCO)
protect a boiler?
shut off the burner when a low water condition exists. - ans-If you cannot determine
water level what do you do?
No - ans-Can you compress a liquid?
Cast Iron Sectional and Firebox - ans-What boilers are low pressure only?
Push nipples and Tie Rods - ans-What holds cast iron sections together?
At least as big as the largest incoming wire - ans-On electric boilers, how large should
the ground wire be?
Baffle - ans-Directs flow of combustion gasses, water, and/or steam
Passes - ans-Amount of times the heat moves through the tubes in a fire tube boiler
Refractory - ans-Hard surface insulation (brick, concrete,...)
Stays - ans-Helps keep shape and position of boiler
Tubing - ans-Measured by Outside Diameter (OD)
Package Boiler - ans-Comes completely assembled with its own feedwater pumps, fuel
system & draft fans
