BOILER LICENSE TEST PRACTICE ASSESSMENT
2026 FULL QUESTIONS AND ANSWERS
GRADED A PLUS COMPLETE REVISION GUIDE
250 ITEMS
◉ The valve or valves that must relieve all excess pressure on a
steam or hot water boiler are what?
Answer: Safety valve and/or an ASME approved safety relief valve.
◉ A Tri indicator could be found on a:
Answer: Hot water boiler
◉ A tri indicator would inform the boiler operator of what?
Answer: The TEMPERATURE of the water, the PRESSURE of the
water in PSIG, and the ALTITUDE of water in feet.
◉ What is the destructive force in a steam or hot water boiler
explosion?
Answer: The instant release of energy stored in the water as heat.
◉ An ASME approved safety relieve calve used on a hot water boiler
is tested at the factory on what?
,Answer: Steam first then hot water.
◉ Some of the things you could find on a steam boiler (or hot water
boiler) are what?
Answer: Low water cut off, safety valve or safety relief valve,
pressure gauge.
◉ What devices would only be found on a steam boiler?
Answer: Steam pressure gauge, tricocks, Pressuretrols
◉ An expansion tank or compression tank would be used in what?
Answer: Hot water boiler
◉ What is the purpose of the expansion tank?
Answer: To provide for expansion and contraction of the water
volume as its temperature varies.
◉ On a hot water boiler, what is the purpose of the vent valve?
Answer: To make sure there is water inside the boiler and to vent
any trapped air.
◉ If the safety valve or ASME safety relief valve leaks you would do
what?
,Answer: Have the valve repaired or replaced.
◉ Tri cocks or gauge cocks are sued on a steam boiler to indicate?
Answer: The true water level inside the boiler.
◉ On a steam or hot water boiler, the safety valve or safety relief
valve could be tested by?
Answer: When the boiler is running lifting the lever on the valve or
raising the pressure until they operate.
◉ Before starting a steam or hot water boiler you should check for
what?
Answer: Water in the boiler.
◉ True or False: Bottom blow down valves are used for both steam
and hot water.
Answer: True
◉ Safety valves or safety relief valves should be manually tested at
least...?
Answer: Monthly
, ◉ The low water cut out is one of the most important
electrical/mechanical devices on your boiler. How often should you
test it?
Answer: Daily
◉ What device must be located between a hot water boiler and the
expansion tank?
Answer: A shut off valve so the expansion can be isolated and
drained during operation of the boiler.
◉ On a hot water boiler, every time the burner operates the safety
relief valve opens. Why?
Answer: The expansion tank is water logged, or the isolating valve
for the expansion tank is closed.
◉ An Aquastat is used on a...?
Answer: Hot water boiler
◉ To reduce thermal shock on hot water boilers, what devices are
used?
Answer: Low limit or low fire hold control, three way valve, run
around pump.
◉ On a steam boiler the control named operator will...
2026 FULL QUESTIONS AND ANSWERS
GRADED A PLUS COMPLETE REVISION GUIDE
250 ITEMS
◉ The valve or valves that must relieve all excess pressure on a
steam or hot water boiler are what?
Answer: Safety valve and/or an ASME approved safety relief valve.
◉ A Tri indicator could be found on a:
Answer: Hot water boiler
◉ A tri indicator would inform the boiler operator of what?
Answer: The TEMPERATURE of the water, the PRESSURE of the
water in PSIG, and the ALTITUDE of water in feet.
◉ What is the destructive force in a steam or hot water boiler
explosion?
Answer: The instant release of energy stored in the water as heat.
◉ An ASME approved safety relieve calve used on a hot water boiler
is tested at the factory on what?
,Answer: Steam first then hot water.
◉ Some of the things you could find on a steam boiler (or hot water
boiler) are what?
Answer: Low water cut off, safety valve or safety relief valve,
pressure gauge.
◉ What devices would only be found on a steam boiler?
Answer: Steam pressure gauge, tricocks, Pressuretrols
◉ An expansion tank or compression tank would be used in what?
Answer: Hot water boiler
◉ What is the purpose of the expansion tank?
Answer: To provide for expansion and contraction of the water
volume as its temperature varies.
◉ On a hot water boiler, what is the purpose of the vent valve?
Answer: To make sure there is water inside the boiler and to vent
any trapped air.
◉ If the safety valve or ASME safety relief valve leaks you would do
what?
,Answer: Have the valve repaired or replaced.
◉ Tri cocks or gauge cocks are sued on a steam boiler to indicate?
Answer: The true water level inside the boiler.
◉ On a steam or hot water boiler, the safety valve or safety relief
valve could be tested by?
Answer: When the boiler is running lifting the lever on the valve or
raising the pressure until they operate.
◉ Before starting a steam or hot water boiler you should check for
what?
Answer: Water in the boiler.
◉ True or False: Bottom blow down valves are used for both steam
and hot water.
Answer: True
◉ Safety valves or safety relief valves should be manually tested at
least...?
Answer: Monthly
, ◉ The low water cut out is one of the most important
electrical/mechanical devices on your boiler. How often should you
test it?
Answer: Daily
◉ What device must be located between a hot water boiler and the
expansion tank?
Answer: A shut off valve so the expansion can be isolated and
drained during operation of the boiler.
◉ On a hot water boiler, every time the burner operates the safety
relief valve opens. Why?
Answer: The expansion tank is water logged, or the isolating valve
for the expansion tank is closed.
◉ An Aquastat is used on a...?
Answer: Hot water boiler
◉ To reduce thermal shock on hot water boilers, what devices are
used?
Answer: Low limit or low fire hold control, three way valve, run
around pump.
◉ On a steam boiler the control named operator will...
