Boiler License Exam Questions with
Correct Answers 100% Pass 2025-
2026
A low pressure steam boiler operates at a pressure of not more than psi.
CORRECT ANSWER 15
The higher the steam pressure, the higher the of water in the boiler.
CORRECT ANSWER boiling point
is the amount of energy equal to the evaporation of 34.5 lb of water/hr from and as a fee
dwater temperature of 212F degrees. CORRECT ANSWER Boiler horsepower
A horizontal return tubular (HRT) boiler is a boiler. CORRECT ANSWER firetube
As steam pressure in a boiler increases, there is a corresponding increase in the .-
CORRECT ANSWER -temperature
water will boil and turn to steam when it reaches °F at atmospheric pressure at sea level
. CORRECT ANSWER 212
A sudden drop in pressure from 100 psig to 0 psig without a corresponding drop in temperature
could result in . CORRECT ANSWER explosion
is the ratio of the heat absorbed by a boiler (output) to the heat available in the fuel
(input). CORRECT ANSWER Thermal efficiency
are used to direct gases so that they come in close contact with the heating surface.
CORRECT ANSWER Baffles
,Some watertube boilers are equipped with to increase the heating surface and the life of t
he furnace refractory. CORRECT ANSWER waterwalls
In a firetube boiler, the heat produced by gases of combustion . CORRECT
ANSWER passes through the tubes
A high pressure steam boiler operates at a steam pressure higher than psi.
CORRECT ANSWER 15
One pound of water is needed to produce ___ lb of steam CORRECT ANSWER 1
No. fuel oil needs to be heated before it is pumped so that it can flow.
CORRECT ANSWER 6
Draft is caused by a difference in pressure between two points. CORRECT
ANSWER the flow of air or gases or gases of combustion
Natural draft is the result of temperature differences between -------------CORRECT ANSWER -
air and gases of combustion
To prevent flame failure from pressure over the MAWP, all steam boilers must be equipped with
at least one ---------CORRECT ANSWER -safety valve
The purpose of a safety valve is to --------- CORRECT ANSWER -
prevent the boiler from exceeding it's MAWP
Safety valves are designed to ------- CORRECT ANSWER -pop open
, When testing a safety valve manually, there must be . CORRECT
ANSWER at least 75% of the safety valve popping pressure on the boiler
Any repairs to the safety valve mustRbe done by the . CORRECT ANSWER
manufacturer- authorized representative
A(n) is used to test the relief capacity of a safety valve. CORRECT
ANSWER accumulation test
A steam pressure gauge must be protected by a siphon to prevent . CORRECT
ANSWER steam from damaging the boiler
The boiler vent is open when warming up a boiler until . CORRECT
ANSWER there is 10 psi-25 psi of steam pressure on the boiler
The ASME Code states that high pressure boilers in battery (two or more boilers connected to a
common header) and equipped with manhole openings must have . CORRECT
ANSWER two main steam stop valves
A main steam stop valve should be a(n) valve. CORRECT ANSWER os&y gate
Boiler safety valves are placed at the highest part of the . CORRECT
ANSWER steam space
A safety valve must be capable of discharging all the steam without the pressure increasing mor
e than ____ % above the maximum MAWP. CORRECT ANSWER 6
A safety valve opens when the exerted by the steam exceeds that of the spring.
CORRECT ANSWER total force
Correct Answers 100% Pass 2025-
2026
A low pressure steam boiler operates at a pressure of not more than psi.
CORRECT ANSWER 15
The higher the steam pressure, the higher the of water in the boiler.
CORRECT ANSWER boiling point
is the amount of energy equal to the evaporation of 34.5 lb of water/hr from and as a fee
dwater temperature of 212F degrees. CORRECT ANSWER Boiler horsepower
A horizontal return tubular (HRT) boiler is a boiler. CORRECT ANSWER firetube
As steam pressure in a boiler increases, there is a corresponding increase in the .-
CORRECT ANSWER -temperature
water will boil and turn to steam when it reaches °F at atmospheric pressure at sea level
. CORRECT ANSWER 212
A sudden drop in pressure from 100 psig to 0 psig without a corresponding drop in temperature
could result in . CORRECT ANSWER explosion
is the ratio of the heat absorbed by a boiler (output) to the heat available in the fuel
(input). CORRECT ANSWER Thermal efficiency
are used to direct gases so that they come in close contact with the heating surface.
CORRECT ANSWER Baffles
,Some watertube boilers are equipped with to increase the heating surface and the life of t
he furnace refractory. CORRECT ANSWER waterwalls
In a firetube boiler, the heat produced by gases of combustion . CORRECT
ANSWER passes through the tubes
A high pressure steam boiler operates at a steam pressure higher than psi.
CORRECT ANSWER 15
One pound of water is needed to produce ___ lb of steam CORRECT ANSWER 1
No. fuel oil needs to be heated before it is pumped so that it can flow.
CORRECT ANSWER 6
Draft is caused by a difference in pressure between two points. CORRECT
ANSWER the flow of air or gases or gases of combustion
Natural draft is the result of temperature differences between -------------CORRECT ANSWER -
air and gases of combustion
To prevent flame failure from pressure over the MAWP, all steam boilers must be equipped with
at least one ---------CORRECT ANSWER -safety valve
The purpose of a safety valve is to --------- CORRECT ANSWER -
prevent the boiler from exceeding it's MAWP
Safety valves are designed to ------- CORRECT ANSWER -pop open
, When testing a safety valve manually, there must be . CORRECT
ANSWER at least 75% of the safety valve popping pressure on the boiler
Any repairs to the safety valve mustRbe done by the . CORRECT ANSWER
manufacturer- authorized representative
A(n) is used to test the relief capacity of a safety valve. CORRECT
ANSWER accumulation test
A steam pressure gauge must be protected by a siphon to prevent . CORRECT
ANSWER steam from damaging the boiler
The boiler vent is open when warming up a boiler until . CORRECT
ANSWER there is 10 psi-25 psi of steam pressure on the boiler
The ASME Code states that high pressure boilers in battery (two or more boilers connected to a
common header) and equipped with manhole openings must have . CORRECT
ANSWER two main steam stop valves
A main steam stop valve should be a(n) valve. CORRECT ANSWER os&y gate
Boiler safety valves are placed at the highest part of the . CORRECT
ANSWER steam space
A safety valve must be capable of discharging all the steam without the pressure increasing mor
e than ____ % above the maximum MAWP. CORRECT ANSWER 6
A safety valve opens when the exerted by the steam exceeds that of the spring.
CORRECT ANSWER total force
