Boiler License Test Questions And
Correct Answers (Verified Answers) Plus
Rationales 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 check valve? - 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
Correct Answers (Verified Answers) Plus
Rationales 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 check valve? - 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
