Boiler Operator Licensing Exam
2025/2026 Exam Questions and Answers
| A+ Score Assured
1 or more safety valves - 🧠 ANSWER ✔✔all steam boilers must have
Locked closed - 🧠 ANSWER ✔✔before anyone enters the boiler drum, the
main steam stop valve, bottom blowdown valves, & feedwater valves
should be
212 degrees F - 🧠 ANSWER ✔✔at atmospheric pressure, water begins to
boil at approximately
Fuel oil, gas, & coal - 🧠 ANSWER ✔✔fuels most commonly used in boilers
Steam pressure gauge - 🧠 ANSWER ✔✔must be connected to the highest
part of the steam side of the boiler
,Half full - 🧠 ANSWER ✔✔with an NOWL in a boiler, the gauge glass is
approximately
Foaming - 🧠 ANSWER ✔✔a high surface tension on top of the boiler water
can lead to
Mud drum - 🧠 ANSWER ✔✔Bottom blowdown on a boiler removes sludge
& sediment from the
Tin - 🧠 ANSWER ✔✔a boiler fusible plug is brass or bronze with a core of
Pounds per square inch - 🧠 ANSWER ✔✔a steam pressure gauge is
calibrated in
Try cocks - 🧠 ANSWER ✔✔a secondary means of determining boiler water
level
Oily waste rag storage - 🧠 ANSWER ✔✔fires caused by spontaneous
combustion are most likely to occur in the
Steam - 🧠 ANSWER ✔✔a siphon installed between the boiler & the
pressure gauge protects the Bourdon tube from
Prevent formation of scale - 🧠 ANSWER ✔✔boiler feedwater is chemically
treated to
, Inside tube surface - 🧠 ANSWER ✔✔in a firetube boiler, soot accumulates
on the
1.5 times the MAWP - 🧠 ANSWER ✔✔the pressure applied on the boiler
during a hydrostatic test should be
Decreased - 🧠 ANSWER ✔✔as fuel oil is heated, its viscosity is
Chimney - 🧠 ANSWER ✔✔the induced draft fan is located between the
boiler & the
Flash when exposed to an open flame - 🧠 ANSWER ✔✔the flash point of
fuel oil is the minimum temperature at which the fuel will
Burn continually - 🧠 ANSWER ✔✔the fire point of fuel oil is the minimum
temperature at which the fuel will
Lowest; flow - 🧠 ANSWER ✔✔the pour point of fuel oil is the ____
temperature at which fuel oil will ____
Dangerous to handle - 🧠 ANSWER ✔✔fuel oil with a low flash point is
Pressure control - 🧠 ANSWER ✔✔the operating range of a steam boiler is
controlled by a
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
2025/2026 Exam Questions and Answers
| A+ Score Assured
1 or more safety valves - 🧠 ANSWER ✔✔all steam boilers must have
Locked closed - 🧠 ANSWER ✔✔before anyone enters the boiler drum, the
main steam stop valve, bottom blowdown valves, & feedwater valves
should be
212 degrees F - 🧠 ANSWER ✔✔at atmospheric pressure, water begins to
boil at approximately
Fuel oil, gas, & coal - 🧠 ANSWER ✔✔fuels most commonly used in boilers
Steam pressure gauge - 🧠 ANSWER ✔✔must be connected to the highest
part of the steam side of the boiler
,Half full - 🧠 ANSWER ✔✔with an NOWL in a boiler, the gauge glass is
approximately
Foaming - 🧠 ANSWER ✔✔a high surface tension on top of the boiler water
can lead to
Mud drum - 🧠 ANSWER ✔✔Bottom blowdown on a boiler removes sludge
& sediment from the
Tin - 🧠 ANSWER ✔✔a boiler fusible plug is brass or bronze with a core of
Pounds per square inch - 🧠 ANSWER ✔✔a steam pressure gauge is
calibrated in
Try cocks - 🧠 ANSWER ✔✔a secondary means of determining boiler water
level
Oily waste rag storage - 🧠 ANSWER ✔✔fires caused by spontaneous
combustion are most likely to occur in the
Steam - 🧠 ANSWER ✔✔a siphon installed between the boiler & the
pressure gauge protects the Bourdon tube from
Prevent formation of scale - 🧠 ANSWER ✔✔boiler feedwater is chemically
treated to
, Inside tube surface - 🧠 ANSWER ✔✔in a firetube boiler, soot accumulates
on the
1.5 times the MAWP - 🧠 ANSWER ✔✔the pressure applied on the boiler
during a hydrostatic test should be
Decreased - 🧠 ANSWER ✔✔as fuel oil is heated, its viscosity is
Chimney - 🧠 ANSWER ✔✔the induced draft fan is located between the
boiler & the
Flash when exposed to an open flame - 🧠 ANSWER ✔✔the flash point of
fuel oil is the minimum temperature at which the fuel will
Burn continually - 🧠 ANSWER ✔✔the fire point of fuel oil is the minimum
temperature at which the fuel will
Lowest; flow - 🧠 ANSWER ✔✔the pour point of fuel oil is the ____
temperature at which fuel oil will ____
Dangerous to handle - 🧠 ANSWER ✔✔fuel oil with a low flash point is
Pressure control - 🧠 ANSWER ✔✔the operating range of a steam boiler is
controlled by a
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
