Boiler Operator Licensing Exam
Questions with Correct Answers
1 or more safety valves - ANSWERSall steam boilers must have
Locked closed - ANSWERSbefore anyone enters the boiler drum, the main steam stop
valve, bottom blowdown valves, & feedwater valves should be
212 degrees F - ANSWERSat atmospheric pressure, water begins to boil at
approximately
Fuel oil, gas, & coal - ANSWERSfuels most commonly used in boilers
Steam pressure gauge - ANSWERSmust be connected to the highest part of the steam
side of the boiler
Half full - ANSWERSwith an NOWL in a boiler, the gauge glass is approximately
Foaming - ANSWERSa high surface tension on top of the boiler water can lead to
Mud drum - ANSWERSBottom blowdown on a boiler removes sludge & sediment from
the
Tin - ANSWERSa boiler fusible plug is brass or bronze with a core of
Pounds per square inch - ANSWERSa steam pressure gauge is calibrated in
Try cocks - ANSWERSa secondary means of determining boiler water level
Oily waste rag storage - ANSWERSfires caused by spontaneous combustion are most
likely to occur in the
Steam - ANSWERSa siphon installed between the boiler & the pressure gauge protects
the Bourdon tube from
Prevent formation of scale - ANSWERSboiler feedwater is chemically treated to
Inside tube surface - ANSWERSin a firetube boiler, soot accumulates on the
1.5 times the MAWP - ANSWERSthe pressure applied on the boiler during a hydrostatic
test should be
, Decreased - ANSWERSas fuel oil is heated, its viscosity is
Chimney - ANSWERSthe induced draft fan is located between the boiler & the
Flash when exposed to an open flame - ANSWERSthe flash point of fuel oil is the
minimum temperature at which the fuel will
Burn continually - ANSWERSthe fire point of fuel oil is the minimum temperature at
which the fuel will
Lowest; flow - ANSWERSthe pour point of fuel oil is the ____ temperature at which fuel
oil will ____
Dangerous to handle - ANSWERSfuel oil with a low flash point is
Pressure control - ANSWERSthe operating range of a steam boiler is controlled by a
Condensate in the line - ANSWERSwater hammer in steam lines is caused by
Manometer - ANSWERSmeasures the difference in pressure between 2 points,
measures draft
Lowest load - ANSWERSthe best time to blowdown a boiler is when it is at its
Silica gel - ANSWERSBoilers that are laid up dry have trays of ____ put in the steam &
water drums to absorb moisture
Mixture; atomization; temperature; time - ANSWERSrequired to obtain complete
combustion of a fuel
Pitting - ANSWERSoxygen in the boiler causes
Secure the fires & feedwater - ANSWERSwhen the boiler low water alarm is ringing, the
operator should
Purging the furnace after ignition failure - ANSWERSa furnace explosion can be
prevented by
Infrared light - ANSWERSa lead sulfide cell which is used for flame detection is
sensitive to
Spring loaded - ANSWERSa pop safety valve is
Secure feedwater going to the boiler - ANSWERSto test a low water fuel cutoff using an
evaporation test, the boiler operator must
Questions with Correct Answers
1 or more safety valves - ANSWERSall steam boilers must have
Locked closed - ANSWERSbefore anyone enters the boiler drum, the main steam stop
valve, bottom blowdown valves, & feedwater valves should be
212 degrees F - ANSWERSat atmospheric pressure, water begins to boil at
approximately
Fuel oil, gas, & coal - ANSWERSfuels most commonly used in boilers
Steam pressure gauge - ANSWERSmust be connected to the highest part of the steam
side of the boiler
Half full - ANSWERSwith an NOWL in a boiler, the gauge glass is approximately
Foaming - ANSWERSa high surface tension on top of the boiler water can lead to
Mud drum - ANSWERSBottom blowdown on a boiler removes sludge & sediment from
the
Tin - ANSWERSa boiler fusible plug is brass or bronze with a core of
Pounds per square inch - ANSWERSa steam pressure gauge is calibrated in
Try cocks - ANSWERSa secondary means of determining boiler water level
Oily waste rag storage - ANSWERSfires caused by spontaneous combustion are most
likely to occur in the
Steam - ANSWERSa siphon installed between the boiler & the pressure gauge protects
the Bourdon tube from
Prevent formation of scale - ANSWERSboiler feedwater is chemically treated to
Inside tube surface - ANSWERSin a firetube boiler, soot accumulates on the
1.5 times the MAWP - ANSWERSthe pressure applied on the boiler during a hydrostatic
test should be
, Decreased - ANSWERSas fuel oil is heated, its viscosity is
Chimney - ANSWERSthe induced draft fan is located between the boiler & the
Flash when exposed to an open flame - ANSWERSthe flash point of fuel oil is the
minimum temperature at which the fuel will
Burn continually - ANSWERSthe fire point of fuel oil is the minimum temperature at
which the fuel will
Lowest; flow - ANSWERSthe pour point of fuel oil is the ____ temperature at which fuel
oil will ____
Dangerous to handle - ANSWERSfuel oil with a low flash point is
Pressure control - ANSWERSthe operating range of a steam boiler is controlled by a
Condensate in the line - ANSWERSwater hammer in steam lines is caused by
Manometer - ANSWERSmeasures the difference in pressure between 2 points,
measures draft
Lowest load - ANSWERSthe best time to blowdown a boiler is when it is at its
Silica gel - ANSWERSBoilers that are laid up dry have trays of ____ put in the steam &
water drums to absorb moisture
Mixture; atomization; temperature; time - ANSWERSrequired to obtain complete
combustion of a fuel
Pitting - ANSWERSoxygen in the boiler causes
Secure the fires & feedwater - ANSWERSwhen the boiler low water alarm is ringing, the
operator should
Purging the furnace after ignition failure - ANSWERSa furnace explosion can be
prevented by
Infrared light - ANSWERSa lead sulfide cell which is used for flame detection is
sensitive to
Spring loaded - ANSWERSa pop safety valve is
Secure feedwater going to the boiler - ANSWERSto test a low water fuel cutoff using an
evaporation test, the boiler operator must
