MN BOILER LICENSE TEST WITH VERIFIED QUESTIONS AND
ANSWERS #7
What is the unit called that controls starting and stopping of the burner by sensing
temperature of water in a hot water boiler? - correct answer Aquastat
What controls the temperature of the water in a hot water boiler system? - correct
answer Aquastat or remote temperature monitoring system
What safety devices should be installed on a hot water heating boiler? - correct answer
Code safety valve(s)
Low water fuel cutoff
What removes air from a hot water boiler system? - correct answer Air control
What valve can be manually opened to provide hot water to the heating units through
natural circulation should a circulating pump fail? - correct answer Flow control valves
What unit turns the burner on and off based on steam pressure? - correct answer
Pressure control or pressurestat
What should be the range of a pressure gauge installed on a steam boiler? - correct
answer At least 1 1/2 times the MAWP of the boiler
What is the definition of absolute pressure? - correct answer Gauge pressure plus 14.7
What is it called when a safety valve rapidly opens and closes? - correct answer
Chattering
What causes furnace explosions? - correct answer A build up of combustible gasses or
vapors in the furnace
How are furnace explosions prevented? - correct answer Purging
What malfunctioning component could cause steam on a steam boiler system to blow
into the vacuum pump or condensate tank? - correct answer Steam trap
What unit shuts off the burner in the event of a low water condition? - correct answer
Low water fuel cut off
What is used to replace water lost by blowing down or to leaks in the system in a steam
boiler system? - correct answer Makeup water
What area of the boiler is used to calculate heating surface? - correct answer The
steam space where evaporation takes place
, Name two methods by which a steam pressure gauge can be tested for accuracy. -
correct answer Comparison to a test gauge
Calibrate with a deadweight tester
What is the definition of one boiler horsepower? - correct answer The evaporation of
34.5 lbs of water per hour from and at a temperature of 212F
What are the cross-sectional area requirements for a discharge pipe installed on a
safety valve? - correct answer No less than the full area of the valve outlet
On a one pipe steam heating boiler system, what is used to distribute steam and to
return condensate? - correct answer The same pipe
Where is the water on a fire tube boiler? - correct answer Surrounds the tubes
When two valves are used on the bottom blowdown line of a steam boiler, what valve is
located closest to the boiler shell? - correct answer Quick opening valve
How is the capacity of a safety valve used on a steam boiler measured? - correct
answer The amount of steam that can be discharged in one hour
In a steam boiler system, how is condensate removed from the heating equipment? -
correct answer Steam trap
Should pressure control fail, what is installed as a safety backup? - correct answer High
limit control
How does the pressure control attached to the steam space of a boiler control the
burner? - correct answer Burner starts on pressure decrease, stops on pressure
increase
What is the purpose of a safety valve on a steam boiler? - correct answer Prevent the
pressure in a steam boiler from exceeding its maximum allowable working pressure
What device prevents contaminated water from entering the domestic water supply? -
correct answer Back flow preventer
Reduced Pressure Zone (RPZ)
When is a boiler considered low pressure? - correct answer Steam boiler NTE 15 psi
and liquid boiler NTE 160 psi and/or 250F
What license is required for operating boiler as a shift engineer in a plant having 3 boiler
each having 1200 sq ft of heating surface? - correct answer First class
ANSWERS #7
What is the unit called that controls starting and stopping of the burner by sensing
temperature of water in a hot water boiler? - correct answer Aquastat
What controls the temperature of the water in a hot water boiler system? - correct
answer Aquastat or remote temperature monitoring system
What safety devices should be installed on a hot water heating boiler? - correct answer
Code safety valve(s)
Low water fuel cutoff
What removes air from a hot water boiler system? - correct answer Air control
What valve can be manually opened to provide hot water to the heating units through
natural circulation should a circulating pump fail? - correct answer Flow control valves
What unit turns the burner on and off based on steam pressure? - correct answer
Pressure control or pressurestat
What should be the range of a pressure gauge installed on a steam boiler? - correct
answer At least 1 1/2 times the MAWP of the boiler
What is the definition of absolute pressure? - correct answer Gauge pressure plus 14.7
What is it called when a safety valve rapidly opens and closes? - correct answer
Chattering
What causes furnace explosions? - correct answer A build up of combustible gasses or
vapors in the furnace
How are furnace explosions prevented? - correct answer Purging
What malfunctioning component could cause steam on a steam boiler system to blow
into the vacuum pump or condensate tank? - correct answer Steam trap
What unit shuts off the burner in the event of a low water condition? - correct answer
Low water fuel cut off
What is used to replace water lost by blowing down or to leaks in the system in a steam
boiler system? - correct answer Makeup water
What area of the boiler is used to calculate heating surface? - correct answer The
steam space where evaporation takes place
, Name two methods by which a steam pressure gauge can be tested for accuracy. -
correct answer Comparison to a test gauge
Calibrate with a deadweight tester
What is the definition of one boiler horsepower? - correct answer The evaporation of
34.5 lbs of water per hour from and at a temperature of 212F
What are the cross-sectional area requirements for a discharge pipe installed on a
safety valve? - correct answer No less than the full area of the valve outlet
On a one pipe steam heating boiler system, what is used to distribute steam and to
return condensate? - correct answer The same pipe
Where is the water on a fire tube boiler? - correct answer Surrounds the tubes
When two valves are used on the bottom blowdown line of a steam boiler, what valve is
located closest to the boiler shell? - correct answer Quick opening valve
How is the capacity of a safety valve used on a steam boiler measured? - correct
answer The amount of steam that can be discharged in one hour
In a steam boiler system, how is condensate removed from the heating equipment? -
correct answer Steam trap
Should pressure control fail, what is installed as a safety backup? - correct answer High
limit control
How does the pressure control attached to the steam space of a boiler control the
burner? - correct answer Burner starts on pressure decrease, stops on pressure
increase
What is the purpose of a safety valve on a steam boiler? - correct answer Prevent the
pressure in a steam boiler from exceeding its maximum allowable working pressure
What device prevents contaminated water from entering the domestic water supply? -
correct answer Back flow preventer
Reduced Pressure Zone (RPZ)
When is a boiler considered low pressure? - correct answer Steam boiler NTE 15 psi
and liquid boiler NTE 160 psi and/or 250F
What license is required for operating boiler as a shift engineer in a plant having 3 boiler
each having 1200 sq ft of heating surface? - correct answer First class
