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Boiler Exam Practice Tests Questions with Explanations of Answers | latest upate 2024
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Boiler Exam Practice Testsremoves sludge and sediment from the mud drum - ANS-The bottom blowdown on a boiler ___.
outside diameter - ANS-Boiler tubes are sized using the ___.
tin - ANS-A boiler fusible plug is brass or bronze with a core of ___.
hairline cracks in the refractory - ANS-Spalling in a boiler refers to ___.
34.5 - ANS-Boiler horsepower is the evaporation of ___ lb of water/hr from and at a feedwater
temperature of 212°F.
steam temperature - ANS-A siphon installed between the boiler and the pressure gauge
protects the Bourdon tube from___.
10 to 11.5 - ANS-The pH of the boiler water should be ___.
steam leaving the boiler - ANS-The boiler superheater raises the temperature of the ___.
feedwater - ANS-An economizer is used to preheat ___.
oily waste rags - ANS-Fires caused by spontaneous combustion would probably start in the ___.
dirty strainers - ANS-A high suction reading on the fuel oil pressure gauge indicates ___.
try cock - ANS-The ___ is a secondary means of determining boiler water level.
pyrometer - ANS-A(n) ___ is used to measure furnace temperature.
1 ½ - ANS-The range of a boiler pressure gauge must not be less than ___ times the safety
valve setting.
prevent formation of scale - ANS-Boiler feedwater is chemically treated to ___.
deadweight tester - ANS-Pressure gauges are calibrated with a(n) ___.
inside tube surface - ANS-In a firetube boiler, soot settles on the ___.
complete - ANS-Carbon dioxide in the flue gas is a sign of ___ combustion.
incomplete - ANS-Carbon monoxide in the flue gas is a sign of ___ combustion.
,Globe - ANS-___ valves should be used for throttling service.
a dirty heating surface - ANS-A gradual increase in chimney temperature indicates ___.
1 ½ - ANS-The pressure applied on the boiler during a hydrostatic test is ___ times the MAWP.
6 - ANS-Boiler safety valve capacity must be such that the steam pressure can never go higher
than ___% above the MAWP.
decreased - ANS-As fuel oil is heated, its viscosity is ___.
6 - ANS-No. ___ fuel oil has the highest Btu content per gallon.
T - ANS-T/F All steam boilers must have one or more safety valves.
T - ANS-T/F An open feedwater heater vents gases to the atmosphere.
F - ANS-T/F A hydrostatic test will determine whether a steam boiler has sufficient relieving
capacity.
T - ANS-T/F When boilers are set in battery, the main steam stop valves, bottom blowdown
valves, and feedwater valves should be locked closed before anyone enters the boiler drums.
F - ANS-T/F Open and closed feedwater heaters are never used at the same time.
T - ANS-T/F In an open feedwater heater, the water and steam come into direct contact; in a
closed feedwater heater, the water and steam are separated.
T - ANS-T/F An economizer is a fuel-saving device that reclaims heat from the gases of
combustion.
F - ANS-T/F Soot accumulation on the tubes of a watertube boiler does not affect the efficiency
of the boiler.
F - ANS-T/F Scale protects the boiler heating surfaces.
F - ANS-T/F Boiler corrosion cannot be prevented as long as water is in contact with metal.
T - ANS-T/F To prevent water hammer, water should be drained out of all high pressure steam
lines
T - ANS-T/F Dry saturated steam is in a gaseous state.
F - ANS-T/F Pressure on water does not change the boiling point of the water.
, F - ANS-T/F The stop valve in a boiler feedwater line should have the pump discharge pressure
on the top of the valve disc when the valve is closed.
T - ANS-T/F According to the ASME Code, weighted lever safety valves cannot be used on
boilers.
F - ANS-T/F The interior of the Bourdon tube in a steam pressure gauge is always filled with live
steam when it is operating.
T - ANS-T/F Safety valves on superheaters should be set to open before main safety valves on
boilers.
T - ANS-T/F When air preheaters or economizers are used in a boiler, induced draft is usually
employed.
T - ANS-T/F Waterwalls permit greater heat absorption per cubic foot of furnace volume than
refractory walls.
T - ANS-T/F A steam trap is a device that removes air and condensate without loss of steam.
F - ANS-T/F Steam traps are only used on high-temperature hot water systems.
T - ANS-T/F Steam traps are used wherever condensate collects.
F - ANS-T/F A boiler feedwater pump cannot become steambound.
F - ANS-T/F In both firetube and watertube boilers, the fire is inside the tubes.
T - ANS-T/F Foaming can lead to carryover.
Steam entering the huddling chamber exposing a larger area for the steam pressure to act on -
ANS-___ makes a pop-type safety valve pop open.
pulling the test lever by hand and then releasing it to allow it to "snap" closed - ANS-Manual
testing of the safety valve is accomplished by ___.
a mixture of water and steam - ANS-The middle try cock should be mounted at the NOWL and,
when operated, should blow ___.
soot blowers - ANS-To ensure good heat transfer in a watertube boiler, the outside of the tubes
are kept clean by ___.
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