BOILER OPERATOR LICENSING
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
(GRADED A+)
Question: Fill in the blank: To ensure safe operation and prevent
overpressurization, ____________ must be installed on every operating steam
boiler.
Answer: ✔✔ 1 or more safety valves (Note: As noted in previous rules, boilers
with over 500 square feet of heating surface require two or more).
Question: For safety and accident prevention, what must be done to the main
steam stop valves, bottom blowdown valves, and feedwater valves before any
technician enters a boiler drum?
Answer: ✔✔ They must be completely shut, tagged, and locked closed
(Lockout/Tagout) to prevent accidental scalding or flooding.
Question: At standard sea-level atmospheric pressure (0 psig), at approximately
what temperature does water reach its boiling point and begin converting into
steam?
Answer: ✔✔ 212 degrees F
Question: What are the three primary types of combustible fuels most commonly
utilized to fire commercial and industrial boiler systems?
Answer: ✔✔ Fuel oil, natural gas, and coal.
Question: To ensure accurate readings, the boiler steam pressure gauge must be
piped and connected directly to which specific area of the boiler?
Answer: ✔✔ The highest part of the steam side of the boiler drum or shell.
, Question: When a boiler is operating steadily at its Normal Operating Water Level
(NOWL), the water level visible in the gauge glass should be approximately how
full?
Answer: ✔✔ Half full
Question: What dangerous operating condition can occur if high surface tension
develops on top of the boiler water due to a buildup of dissolved solids, oils, or
high pH?
Answer: ✔✔ Foaming (which stabilizes steam bubbles on the water surface,
causing false water level readings and carryover into steam lines).
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
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
(GRADED A+)
Question: Fill in the blank: To ensure safe operation and prevent
overpressurization, ____________ must be installed on every operating steam
boiler.
Answer: ✔✔ 1 or more safety valves (Note: As noted in previous rules, boilers
with over 500 square feet of heating surface require two or more).
Question: For safety and accident prevention, what must be done to the main
steam stop valves, bottom blowdown valves, and feedwater valves before any
technician enters a boiler drum?
Answer: ✔✔ They must be completely shut, tagged, and locked closed
(Lockout/Tagout) to prevent accidental scalding or flooding.
Question: At standard sea-level atmospheric pressure (0 psig), at approximately
what temperature does water reach its boiling point and begin converting into
steam?
Answer: ✔✔ 212 degrees F
Question: What are the three primary types of combustible fuels most commonly
utilized to fire commercial and industrial boiler systems?
Answer: ✔✔ Fuel oil, natural gas, and coal.
Question: To ensure accurate readings, the boiler steam pressure gauge must be
piped and connected directly to which specific area of the boiler?
Answer: ✔✔ The highest part of the steam side of the boiler drum or shell.
, Question: When a boiler is operating steadily at its Normal Operating Water Level
(NOWL), the water level visible in the gauge glass should be approximately how
full?
Answer: ✔✔ Half full
Question: What dangerous operating condition can occur if high surface tension
develops on top of the boiler water due to a buildup of dissolved solids, oils, or
high pH?
Answer: ✔✔ Foaming (which stabilizes steam bubbles on the water surface,
causing false water level readings and carryover into steam lines).
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
