Boiler License Test Questions with Correct
Answers 100% Pass 2025-2026
Natural draft is produced by? CORRECT ANSWER
difference in temperature outside chimney from inside chimney
If a draft fan is located between the boiler and chimney, what type of draft system is it? -
CORRECT ANSWER -Induced draft
boiler fittings are important for: CORRECT ANSWER safety only
thermostatic traps remove air and cool condensate: true or false CORRECT ANSWER True
The main purpose of testing a safety value is to: CORRECT ANSWER
make sure valve operates freely
when testing a safety valve by hand, you must: CORRECT ANSWER
have at least 75% of popping pressure
If a license is expired, how long can it be expired before it is null and void? CORRECT
ANSWER 3 years
What is the purpose of a checkRvalve? CORRECT ANSWER
prevent reverse flow, allows flow in one direction
What is a solenoid valve? CORRECT ANSWER An automatic gas shutoff valve
What # oil needs to be preheated with what piece of equipment? CORRECT
ANSWER #6 oil with a heater
, What type of test is a hardness test? CORRECT ANSWER A titration test
What is the most important rule in operating boilers? CORRECT ANSWER
keep water at proper level
what is the capacity of a safety valve measured in? CORRECT
ANSWER Pounds of steam per house (#steam/hr)
What prevents a furnace explosion? CORRECT ANSWER The purge cycle
Ignition failure would cause activation of the: CORRECT ANSWER Purge Cycle
What is the most common cause of cast iron boiler failure? CORRECT ANSWER Cracking
What is the most common cause of problems in a hot water system? CORRECT ANSWER Air
Where would you place a water temperature indicator? CORRECT ANSWER
At the boiler supply
A chief engineer is not needed in a low pressure plant: true or false CORRECT ANSWER True
The positioning control cannot function without? CORRECT ANSWER air
what fire tube boiler is most efficient CORRECT ANSWER 4Rpass
What is the maximum size blowdown line? CORRECT ANSWER 2 1/2 inches
Answers 100% Pass 2025-2026
Natural draft is produced by? CORRECT ANSWER
difference in temperature outside chimney from inside chimney
If a draft fan is located between the boiler and chimney, what type of draft system is it? -
CORRECT ANSWER -Induced draft
boiler fittings are important for: CORRECT ANSWER safety only
thermostatic traps remove air and cool condensate: true or false CORRECT ANSWER True
The main purpose of testing a safety value is to: CORRECT ANSWER
make sure valve operates freely
when testing a safety valve by hand, you must: CORRECT ANSWER
have at least 75% of popping pressure
If a license is expired, how long can it be expired before it is null and void? CORRECT
ANSWER 3 years
What is the purpose of a checkRvalve? CORRECT ANSWER
prevent reverse flow, allows flow in one direction
What is a solenoid valve? CORRECT ANSWER An automatic gas shutoff valve
What # oil needs to be preheated with what piece of equipment? CORRECT
ANSWER #6 oil with a heater
, What type of test is a hardness test? CORRECT ANSWER A titration test
What is the most important rule in operating boilers? CORRECT ANSWER
keep water at proper level
what is the capacity of a safety valve measured in? CORRECT
ANSWER Pounds of steam per house (#steam/hr)
What prevents a furnace explosion? CORRECT ANSWER The purge cycle
Ignition failure would cause activation of the: CORRECT ANSWER Purge Cycle
What is the most common cause of cast iron boiler failure? CORRECT ANSWER Cracking
What is the most common cause of problems in a hot water system? CORRECT ANSWER Air
Where would you place a water temperature indicator? CORRECT ANSWER
At the boiler supply
A chief engineer is not needed in a low pressure plant: true or false CORRECT ANSWER True
The positioning control cannot function without? CORRECT ANSWER air
what fire tube boiler is most efficient CORRECT ANSWER 4Rpass
What is the maximum size blowdown line? CORRECT ANSWER 2 1/2 inches
