MN BOILER LICENSE TESTED EXAM
QUESTIONS WITH VERIFIED ANSWERS
LATEST UPDATE
What are the three basic types of low pressure boilers? - Answer-Fire tube
Water tube
Cast iron sectional
If idle boilers are left filled with water, what precaution should be taken to prevent
corrosion and oxygen pitting? - Answer-Keep boiler water properly treated
What is the first thing a boiler operator should check when entering the boiler room of a
steam boiler system? - Answer-Water level of the boiler
What is the purpose of a duplex strainer being located on the suction line before the fuel
oil pump? - Answer-The boiler can be run while cleaning the strainer
What documents should be prominently displayed in the boiler room? - Answer-Boiler
operator license
Certificate of inspection or exemption
State inspector private insurance
What is the maximum pressure carried on a low pressure hot water boiler? - Answer-
160 psi
What boiler furnishes hot water to be used externally to itself? - Answer-Hot water
supply boiler
What is the maximum sized safety valve that may be installed on a low pressure boiler?
- Answer-4 1/2"
What should be adjusted if a deposit of carbon appears on the rear wall of the
combustion chamber of a mechanical pressure type oil burner? - Answer-Try a wider
nozzle
The difference in pressure between two points causing fluid flow is called what? -
Answer-Draft
, The rapid burning of fuel and oxygen resulting in the release of heat is known as what?
- Answer-Combustion
What graduations are required on the dial of a gauge on a low pressure boiler? -
Answer-1 1/2 -2 times the max allowable working pressure (MAWP)
What is the approximate heating value of No. 2 fuel oil? - Answer-141,000 BTU/gal
What valve is installed to control the rate at which water flows? - Answer-Globe valve
Where is the bottom blowdown line located on a steam boiler? - Answer-Lowest point of
the waterside of a steam boiler
What is a possible causes of water hammer is a steam boiler system? - Answer-
Carryover
At what temperature should water be when applying a hydrostatic test on a boiler? -
Answer-70F
What does the flue gas analyzer measure? - Answer-Percentage volume of carbon
dioxide, carbon monoxide, and oxygen
How many turns from fully closed to fully open is required on a slow opening blowdown
valve? - Answer-5
What is used to ensure all fuel is properly burned in a boiler, and thus attain better
efficiency in heat release? - Answer-Excess air
How many btu's are in the latent heat of evaporation? - Answer-212
How many years of experience are required for each boiler engineer license? - Answer-
Special - None
2nd Class - 1 yr
1st Class - 3 yrs
Chief - 5 yrs
What is the definition of heating surface? - Answer-Water on one side, hot gas on the
other side
What is the definition of sensible heat? - Answer-Heat that can be measured by a
thermometer or can be felt
What is the unit called that controls starting and stopping of the burner by sensing
temperature of water in a hot water boiler? - Answer-Aquastat
QUESTIONS WITH VERIFIED ANSWERS
LATEST UPDATE
What are the three basic types of low pressure boilers? - Answer-Fire tube
Water tube
Cast iron sectional
If idle boilers are left filled with water, what precaution should be taken to prevent
corrosion and oxygen pitting? - Answer-Keep boiler water properly treated
What is the first thing a boiler operator should check when entering the boiler room of a
steam boiler system? - Answer-Water level of the boiler
What is the purpose of a duplex strainer being located on the suction line before the fuel
oil pump? - Answer-The boiler can be run while cleaning the strainer
What documents should be prominently displayed in the boiler room? - Answer-Boiler
operator license
Certificate of inspection or exemption
State inspector private insurance
What is the maximum pressure carried on a low pressure hot water boiler? - Answer-
160 psi
What boiler furnishes hot water to be used externally to itself? - Answer-Hot water
supply boiler
What is the maximum sized safety valve that may be installed on a low pressure boiler?
- Answer-4 1/2"
What should be adjusted if a deposit of carbon appears on the rear wall of the
combustion chamber of a mechanical pressure type oil burner? - Answer-Try a wider
nozzle
The difference in pressure between two points causing fluid flow is called what? -
Answer-Draft
, The rapid burning of fuel and oxygen resulting in the release of heat is known as what?
- Answer-Combustion
What graduations are required on the dial of a gauge on a low pressure boiler? -
Answer-1 1/2 -2 times the max allowable working pressure (MAWP)
What is the approximate heating value of No. 2 fuel oil? - Answer-141,000 BTU/gal
What valve is installed to control the rate at which water flows? - Answer-Globe valve
Where is the bottom blowdown line located on a steam boiler? - Answer-Lowest point of
the waterside of a steam boiler
What is a possible causes of water hammer is a steam boiler system? - Answer-
Carryover
At what temperature should water be when applying a hydrostatic test on a boiler? -
Answer-70F
What does the flue gas analyzer measure? - Answer-Percentage volume of carbon
dioxide, carbon monoxide, and oxygen
How many turns from fully closed to fully open is required on a slow opening blowdown
valve? - Answer-5
What is used to ensure all fuel is properly burned in a boiler, and thus attain better
efficiency in heat release? - Answer-Excess air
How many btu's are in the latent heat of evaporation? - Answer-212
How many years of experience are required for each boiler engineer license? - Answer-
Special - None
2nd Class - 1 yr
1st Class - 3 yrs
Chief - 5 yrs
What is the definition of heating surface? - Answer-Water on one side, hot gas on the
other side
What is the definition of sensible heat? - Answer-Heat that can be measured by a
thermometer or can be felt
What is the unit called that controls starting and stopping of the burner by sensing
temperature of water in a hot water boiler? - Answer-Aquastat
