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
