CLASS 5 BOILER REVISION EXAM 2025/2026 QUESTIONS
WITH ANSWERS GRADED A+
✔✔F - ✔✔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 - ✔✔T/F According to the ASME Code, weighted lever safety valves cannot be
used on boilers.
✔✔F - ✔✔T/F The interior of the Bourdon tube in a steam pressure gauge is always
filled with live steam when it is operating.
✔✔T - ✔✔T/F Safety valves on superheaters should be set to open before main safety
valves on boilers.
✔✔T - ✔✔T/F When air preheaters or economizers are used in a boiler, induced draft is
usually employed.
✔✔T - ✔✔T/F Waterwalls permit greater heat absorption per cubic foot of furnace
volume than refractory walls.
✔✔T - ✔✔T/F A steam trap is a device that removes air and condensate without loss of
steam.
✔✔F - ✔✔T/F Steam traps are only used on high-temperature hot water systems.
✔✔T - ✔✔T/F Steam traps are used wherever condensate collects.
✔✔F - ✔✔T/F A boiler feedwater pump cannot become steambound.
✔✔F - ✔✔T/F In both firetube and watertube boilers, the fire is inside the tubes.
✔✔T - ✔✔T/F Foaming can lead to carryover.
✔✔Steam entering the huddling chamber exposing a larger area for the steam pressure
to act on - ✔✔___ makes a pop-type safety valve pop open.
✔✔pulling the test lever by hand and then releasing it to allow it to "snap" closed -
✔✔Manual testing of the safety valve is accomplished by ___.
✔✔a mixture of water and steam - ✔✔The middle try cock should be mounted at the
NOWL and, when operated, should blow ___.
,✔✔soot blowers - ✔✔To ensure good heat transfer in a watertube boiler, the outside of
the tubes are kept clean by ___.
✔✔recommended feedwater treatment - ✔✔To ensure good heat transfer in a firetube
boiler, the outside of the tubes are kept clean by ___.
✔✔1 - ✔✔When economizers are used to heat boiler feedwater, every 10°F rise in
feedwater temperature is accompanied by a ___% savings in fuel.
✔✔the boiler's main steam stop valves, feedwater lines, and bottom blowdown lines be
closed, locked, and tagged out - ✔✔Proper safety procedure requires that ___ before
anyone is allowed to enter the steam and water drum.
✔✔boiler setting is cool enough to enter the firebox - ✔✔Boilers taken off-line for
cleaning and inspection may be dumped (emptied) when the ___.
✔✔Overfire air - ✔✔___ is necessary to burn the volatile matter in coal more efficiently.
✔✔boiler; chimney - ✔✔The induced draft fan is located between the ___ and ___.
✔✔flash when exposed to an open flame - ✔✔The flash point of fuel oil is the minimum
temperature at which the fuel oil will ___.
✔✔burn continually - ✔✔The fire point of fuel oil is the minimum temperature at which
the fuel oil will ___.
✔✔lowest; flow - ✔✔The pour point of fuel oil is the ___ temperature at which fuel oil
will ___.
✔✔dangerous to handle - ✔✔Fuel oil with a low flash point is ___.
✔✔Sulfur - ✔✔___ dioxide is a major cause of air pollution and is caused by burning
fuel oil.
✔✔do not mix - ✔✔In a closed feedwater heater, the steam and water ___.
✔✔operating pressure control - ✔✔The operating range of a steam boiler is controlled
by a(n) ___.
✔✔condensation in the line - ✔✔Water hammer in steam lines is caused by ___.
✔✔difference in pressure between two points - ✔✔A manometer measures ___.
✔✔atmospheric pressure - ✔✔A barometer measures ___.
, ✔✔horizontal return tubular - ✔✔In boiler room work, HRT means ___.
✔✔the superheater safety valve opens first - ✔✔The safety valves on the boiler drum
and superheater safety valves of a steam boiler are set so that ___.
✔✔at its lowest load - ✔✔The best time to blow down a boiler is when it is ___.
✔✔testing the boiler water - ✔✔The frequency of blowing down the boiler can best be
determined by ___.
✔✔at least once a shift - ✔✔In most plants, the suggested operating procedure is to
blow down the water column and gauge glass ___.
✔✔F - ✔✔T/F Softened water is used in a boiler to prevent pitting of the boiler metal.
✔✔F - ✔✔T/F All firetube boilers are horizontal boilers.
✔✔T - ✔✔T/F If the top line to a boiler gauge glass were closed, the water in the glass
would rise to the top.
✔✔F - ✔✔T/F The boiling point of water is not affected by boiler pressure.
✔✔T - ✔✔T/F Priming can be a direct result of maintaining too high a water level in the
boiler.
✔✔F - ✔✔T/F In the closed feedwater heater, steam and water come into direct contact
with each other.
✔✔T - ✔✔T/F The automatic nonreturn valve is on the main steam line.
✔✔T - ✔✔T/F If a plant has only one boiler, an automatic nonreturn valve is not
necessary.
✔✔F - ✔✔T/F It is unnecessary to blow down a boiler if proper feedwater treatment is
used.
✔✔F - ✔✔T/F A high pressure cutoff control can take the place of a safety valve.
✔✔T - ✔✔T/F Both stop and check valves must be installed on the boiler feedwater line.
✔✔T - ✔✔T/F Try cocks on a water column can be used to determine the water level if
the gauge glass is broken.
WITH ANSWERS GRADED A+
✔✔F - ✔✔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 - ✔✔T/F According to the ASME Code, weighted lever safety valves cannot be
used on boilers.
✔✔F - ✔✔T/F The interior of the Bourdon tube in a steam pressure gauge is always
filled with live steam when it is operating.
✔✔T - ✔✔T/F Safety valves on superheaters should be set to open before main safety
valves on boilers.
✔✔T - ✔✔T/F When air preheaters or economizers are used in a boiler, induced draft is
usually employed.
✔✔T - ✔✔T/F Waterwalls permit greater heat absorption per cubic foot of furnace
volume than refractory walls.
✔✔T - ✔✔T/F A steam trap is a device that removes air and condensate without loss of
steam.
✔✔F - ✔✔T/F Steam traps are only used on high-temperature hot water systems.
✔✔T - ✔✔T/F Steam traps are used wherever condensate collects.
✔✔F - ✔✔T/F A boiler feedwater pump cannot become steambound.
✔✔F - ✔✔T/F In both firetube and watertube boilers, the fire is inside the tubes.
✔✔T - ✔✔T/F Foaming can lead to carryover.
✔✔Steam entering the huddling chamber exposing a larger area for the steam pressure
to act on - ✔✔___ makes a pop-type safety valve pop open.
✔✔pulling the test lever by hand and then releasing it to allow it to "snap" closed -
✔✔Manual testing of the safety valve is accomplished by ___.
✔✔a mixture of water and steam - ✔✔The middle try cock should be mounted at the
NOWL and, when operated, should blow ___.
,✔✔soot blowers - ✔✔To ensure good heat transfer in a watertube boiler, the outside of
the tubes are kept clean by ___.
✔✔recommended feedwater treatment - ✔✔To ensure good heat transfer in a firetube
boiler, the outside of the tubes are kept clean by ___.
✔✔1 - ✔✔When economizers are used to heat boiler feedwater, every 10°F rise in
feedwater temperature is accompanied by a ___% savings in fuel.
✔✔the boiler's main steam stop valves, feedwater lines, and bottom blowdown lines be
closed, locked, and tagged out - ✔✔Proper safety procedure requires that ___ before
anyone is allowed to enter the steam and water drum.
✔✔boiler setting is cool enough to enter the firebox - ✔✔Boilers taken off-line for
cleaning and inspection may be dumped (emptied) when the ___.
✔✔Overfire air - ✔✔___ is necessary to burn the volatile matter in coal more efficiently.
✔✔boiler; chimney - ✔✔The induced draft fan is located between the ___ and ___.
✔✔flash when exposed to an open flame - ✔✔The flash point of fuel oil is the minimum
temperature at which the fuel oil will ___.
✔✔burn continually - ✔✔The fire point of fuel oil is the minimum temperature at which
the fuel oil will ___.
✔✔lowest; flow - ✔✔The pour point of fuel oil is the ___ temperature at which fuel oil
will ___.
✔✔dangerous to handle - ✔✔Fuel oil with a low flash point is ___.
✔✔Sulfur - ✔✔___ dioxide is a major cause of air pollution and is caused by burning
fuel oil.
✔✔do not mix - ✔✔In a closed feedwater heater, the steam and water ___.
✔✔operating pressure control - ✔✔The operating range of a steam boiler is controlled
by a(n) ___.
✔✔condensation in the line - ✔✔Water hammer in steam lines is caused by ___.
✔✔difference in pressure between two points - ✔✔A manometer measures ___.
✔✔atmospheric pressure - ✔✔A barometer measures ___.
, ✔✔horizontal return tubular - ✔✔In boiler room work, HRT means ___.
✔✔the superheater safety valve opens first - ✔✔The safety valves on the boiler drum
and superheater safety valves of a steam boiler are set so that ___.
✔✔at its lowest load - ✔✔The best time to blow down a boiler is when it is ___.
✔✔testing the boiler water - ✔✔The frequency of blowing down the boiler can best be
determined by ___.
✔✔at least once a shift - ✔✔In most plants, the suggested operating procedure is to
blow down the water column and gauge glass ___.
✔✔F - ✔✔T/F Softened water is used in a boiler to prevent pitting of the boiler metal.
✔✔F - ✔✔T/F All firetube boilers are horizontal boilers.
✔✔T - ✔✔T/F If the top line to a boiler gauge glass were closed, the water in the glass
would rise to the top.
✔✔F - ✔✔T/F The boiling point of water is not affected by boiler pressure.
✔✔T - ✔✔T/F Priming can be a direct result of maintaining too high a water level in the
boiler.
✔✔F - ✔✔T/F In the closed feedwater heater, steam and water come into direct contact
with each other.
✔✔T - ✔✔T/F The automatic nonreturn valve is on the main steam line.
✔✔T - ✔✔T/F If a plant has only one boiler, an automatic nonreturn valve is not
necessary.
✔✔F - ✔✔T/F It is unnecessary to blow down a boiler if proper feedwater treatment is
used.
✔✔F - ✔✔T/F A high pressure cutoff control can take the place of a safety valve.
✔✔T - ✔✔T/F Both stop and check valves must be installed on the boiler feedwater line.
✔✔T - ✔✔T/F Try cocks on a water column can be used to determine the water level if
the gauge glass is broken.
