Boiler Operator Licensing Exam – Practice Questions
& 100% Verified Answers | Complete Boiler Operator
Certification Review | 2026–2027
, 1 or more safety valves all steam boilers must have
Locked closed before anyone enters the boiler drum, the main steam stop valve, bottom blowdown
valves, & feedwater valves should be
212 degrees F at atmospheric pressure, water begins to boil at approximately
Fuel oil, gas, & coal fuels most commonly used in boilers
Steam pressure gauge must be connected to the highest part of the steam side of the boiler
Half full with an NOWL in a boiler, the gauge glass is approximately
Foaming a high surface tension on top of the boiler water can lead to
Mud drum Bottom blowdown on a boiler removes sludge & sediment from the
Tin a boiler fusible plug is brass or bronze with a core of
Pounds per square inch a steam pressure gauge is calibrated in
Try cocks a secondary means of determining boiler water level
Oily waste rag storage fires caused by spontaneous combustion are most likely to occur in the
Steam a siphon installed between the boiler & the pressure gauge protects the Bourdon
tube from
Prevent formation of scale boiler feedwater is chemically treated to
Inside tube surface in a firetube boiler, soot accumulates on the
& 100% Verified Answers | Complete Boiler Operator
Certification Review | 2026–2027
, 1 or more safety valves all steam boilers must have
Locked closed before anyone enters the boiler drum, the main steam stop valve, bottom blowdown
valves, & feedwater valves should be
212 degrees F at atmospheric pressure, water begins to boil at approximately
Fuel oil, gas, & coal fuels most commonly used in boilers
Steam pressure gauge must be connected to the highest part of the steam side of the boiler
Half full with an NOWL in a boiler, the gauge glass is approximately
Foaming a high surface tension on top of the boiler water can lead to
Mud drum Bottom blowdown on a boiler removes sludge & sediment from the
Tin a boiler fusible plug is brass or bronze with a core of
Pounds per square inch a steam pressure gauge is calibrated in
Try cocks a secondary means of determining boiler water level
Oily waste rag storage fires caused by spontaneous combustion are most likely to occur in the
Steam a siphon installed between the boiler & the pressure gauge protects the Bourdon
tube from
Prevent formation of scale boiler feedwater is chemically treated to
Inside tube surface in a firetube boiler, soot accumulates on the
