Boiler License Test Questions with
Verified Answers
Natural draft is produced by? - ANSWERSdifference 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? -
ANSWERSInduced draft
boiler fittings are important for: - ANSWERSsafety only
thermostatic traps remove air and cool condensate: true or false - ANSWERSTrue
The main purpose of testing a safety value is to: - ANSWERSmake sure valve operates
freely
when testing a safety valve by hand, you must: - ANSWERShave at least 75% of
popping pressure
If a license is expired, how long can it be expired before it is null and void? -
ANSWERS3 years
What is the purpose of a check valve? - ANSWERSprevent reverse flow, allows flow in
one direction
What is a solenoid valve? - ANSWERSAn automatic gas shutoff valve
What # oil needs to be preheated with what piece of equipment? - ANSWERS#6 oil with
a heater
What type of test is a hardness test? - ANSWERSA titration test
What is the most important rule in operating boilers? - ANSWERSkeep water at proper
level
what is the capacity of a safety valve measured in? - ANSWERSPounds of steam per
house (#steam/hr)
What prevents a furnace explosion? - ANSWERSThe purge cycle
Ignition failure would cause activation of the: - ANSWERSPurge Cycle
What is the most common cause of cast iron boiler failure? - ANSWERSCracking
, What is the most common cause of problems in a hot water system? - ANSWERSAir
Where would you place a water temperature indicator? - ANSWERSAt the boiler supply
A chief engineer is not needed in a low pressure plant: true or false - ANSWERSTrue
The positioning control cannot function without? - ANSWERSair
what fire tube boiler is most efficient - ANSWERS4 pass
What is the maximum size blowdown line? - ANSWERS2 1/2 inches
when do you close a boiler vent? - ANSWERSWhen steam comes out
Carryover can lead to: - ANSWERSwater hammer
if water leaves the boiler at 170 degrees, what temperature does it return at? -
ANSWERS150 degrees
Where are the combustion gases on a serpentine boiler? - ANSWERSbelow the tubes
What does PSIA stand for? - ANSWERSPsig + atmospheric pressure
When should the water column and gauge glass should be blown down? -
ANSWERSDaily
What oil has to be heated? - ANSWERS#6 oil
Natural water may contain: - ANSWERSsolids and other pollutants
The expansion tank in a hot water system allows for the expansion of: -
ANSWERSwater
As the water in a hot system expands: - ANSWERSthe pressure remains constant
Boiler water should have a pH of: - ANSWERS11
safety valves should be tested: - ANSWERSonce a month
What is the most important fitting on a boiler? - ANSWERSSafety valve
An aquastat is sensitive to change in: - ANSWERSWater temperature
Who can adjust a safety valve? - ANSWERSManufacturer representative
Verified Answers
Natural draft is produced by? - ANSWERSdifference 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? -
ANSWERSInduced draft
boiler fittings are important for: - ANSWERSsafety only
thermostatic traps remove air and cool condensate: true or false - ANSWERSTrue
The main purpose of testing a safety value is to: - ANSWERSmake sure valve operates
freely
when testing a safety valve by hand, you must: - ANSWERShave at least 75% of
popping pressure
If a license is expired, how long can it be expired before it is null and void? -
ANSWERS3 years
What is the purpose of a check valve? - ANSWERSprevent reverse flow, allows flow in
one direction
What is a solenoid valve? - ANSWERSAn automatic gas shutoff valve
What # oil needs to be preheated with what piece of equipment? - ANSWERS#6 oil with
a heater
What type of test is a hardness test? - ANSWERSA titration test
What is the most important rule in operating boilers? - ANSWERSkeep water at proper
level
what is the capacity of a safety valve measured in? - ANSWERSPounds of steam per
house (#steam/hr)
What prevents a furnace explosion? - ANSWERSThe purge cycle
Ignition failure would cause activation of the: - ANSWERSPurge Cycle
What is the most common cause of cast iron boiler failure? - ANSWERSCracking
, What is the most common cause of problems in a hot water system? - ANSWERSAir
Where would you place a water temperature indicator? - ANSWERSAt the boiler supply
A chief engineer is not needed in a low pressure plant: true or false - ANSWERSTrue
The positioning control cannot function without? - ANSWERSair
what fire tube boiler is most efficient - ANSWERS4 pass
What is the maximum size blowdown line? - ANSWERS2 1/2 inches
when do you close a boiler vent? - ANSWERSWhen steam comes out
Carryover can lead to: - ANSWERSwater hammer
if water leaves the boiler at 170 degrees, what temperature does it return at? -
ANSWERS150 degrees
Where are the combustion gases on a serpentine boiler? - ANSWERSbelow the tubes
What does PSIA stand for? - ANSWERSPsig + atmospheric pressure
When should the water column and gauge glass should be blown down? -
ANSWERSDaily
What oil has to be heated? - ANSWERS#6 oil
Natural water may contain: - ANSWERSsolids and other pollutants
The expansion tank in a hot water system allows for the expansion of: -
ANSWERSwater
As the water in a hot system expands: - ANSWERSthe pressure remains constant
Boiler water should have a pH of: - ANSWERS11
safety valves should be tested: - ANSWERSonce a month
What is the most important fitting on a boiler? - ANSWERSSafety valve
An aquastat is sensitive to change in: - ANSWERSWater temperature
Who can adjust a safety valve? - ANSWERSManufacturer representative
