BOILER LICENSE TESTBANK QUESTIONS
WITH VERIFIED ANSWERS LATEST UPDATE
When using forced draft, the pressure inside the furnace is: - Answer-more than
atmospheric pressure
In a gas burner, a ____ is a formed sheet-metal plate with the slots where the metal is
bent on an angle. - Answer-Register
The most accurate means of deciding the frequency of a blow down of a boiler is
determined by a: - Answer-Water analysis
How is draft controlled in a natural draft system? - Answer-Outlet dampers
The main purpose of the water column is to: - Answer-reduce turbulence in the gauge
glass to get a more accurate reading of the water level in the boiler
When a boiler is being inspected, the two main steam stop valves are: - Answer-closed,
locked, and tagged
Closer control of boiler water chemical concentrations is maintained by - Answer-
continuous blowdowns
Chemicals added to the boiler water change the scale-forming salts into a ___ -
Answer-non-adhering sludge
A Three-element feed water regulator regulates the amount of feed water by measuring:
- Answer-The steam flow out of the boiler, feed water flow into the boiler and water level
in the boiler.
___ is the process of removing water from a boiler near the NOWL to control the
quantity of impurities in the remaining water. - Answer-surface blowdown
What does it mean to drop the fusible plug? - Answer-It means you melted the fusible
plug
What is located on the water column to keep sludge and sediment from building inside?
- Answer-Blowdown valve
,On a PH scale, what is a 7 considered? Also what is higher and lower than 7
considered? - Answer-7= Neutral
Higher= Caustic
Lower= Acidic
A mercury-tube pressure control will only be accurate when it is installed - Answer-in a
vertical position
To eliminate the danger of a furnace explosion during start-up, the firing sequence must
first allow for: - Answer-a pre-purge period
The positioning combustion control system used on older boilers can't function without -
Answer-Air pressure(Pneumatic)
What is the purpose of the lower section of the water column? - Answer-Sediment
chamber
When cutting in a boiler equipped with a hand-operated main steam valve in on-line, the
steam pressure on the incoming boiler should be: - Answer-Slightly lower than the line
pressure
What is a high pressure boiler? - Answer-Operates over 15 psi, 6+ BHP
Where do the gases of combustion pass in a water tube boiler? - Answer-around the
tubes
A sudden drop in boiler steam pressure without a corresponding drop in boiler water
temperature could result in: - Answer-a boiler explosion
What is the pressure at which the density of water and steam are the same? - Answer-
Critical pressure
A horizontal return tubular (HRT) boiler is a ___ boiler. - Answer-firetube
A manual reset valve is a ___ valve that remains open as long as the electrical coil is
energized. - Answer-solenoid
Bituminous coal has a high ____ content. - Answer-volatile
Anthracite coal has a high ____ content. - Answer-Carbon
Duplex strainers are found on ____ of the fuel oil pumps. - Answer-Suction and
discharge side
The four systems required to operate a steam boiler are ___. - Answer-steam,
feedwater, fuel, and draft
, When testing a safety valve by hand, you must: - Answer-Have at least 75% of popping
pressure
An automatic non-return valve should be opened during start up when the steam
pressure on the boiler reaches: - Answer-75-85% of the line pressure
What does an accumulation test do? - Answer-It tests the relief capacity of the boiler
safety valves
An ___ heats feed water by passing it through a heat exchanger placed in the path of
the gases of combustion. - Answer-Economizer
A British Thermal unit is a measurement of the quantity of heat required to raise the
temperature of ____ of water by ____ - Answer-1 LB , 1 F
The sequence of three numbers (4x2x4) found on a data plate of a reciprocating feed
water pump indicates the: - Answer-(4) Diameter of a steam piston, (2) Diameter of a
Water Piston, (4)Length of the pump stroke
The metering combustion control system is sensitive to changes in: - Answer-steam
flow and pressure
____ point is the lowest temperature at which liquid will flow from one container to
another. - Answer-pour
The pressure at the base of a vertical foot of water is: - Answer-.433 psi
____ contribute to the overall efficiency of a steam plant by the removal of air and
condensate from steam lines and heat exchangers. - Answer-Steam traps
Three types of heat transfer are: - Answer-conduction, convection, radiation
Following flame failure, controls must de-energize fuel and ignition circuits within: -
Answer-4 seconds
In order to burn 1LB of fuel ___ LB(s) of air are needed. - Answer-15, this applies to a
fuel types
If a quick-opening valve is used as a bottom blowdown valve, it must be located -
Answer-between the boiler and the slow-opening (screw-type) valve
What can steam separators do? What can't they do? - Answer-Do: Conserve energy of
steam, prevent water hammer, and protect equipment from water impingement
Don't: Add heat to the system
WITH VERIFIED ANSWERS LATEST UPDATE
When using forced draft, the pressure inside the furnace is: - Answer-more than
atmospheric pressure
In a gas burner, a ____ is a formed sheet-metal plate with the slots where the metal is
bent on an angle. - Answer-Register
The most accurate means of deciding the frequency of a blow down of a boiler is
determined by a: - Answer-Water analysis
How is draft controlled in a natural draft system? - Answer-Outlet dampers
The main purpose of the water column is to: - Answer-reduce turbulence in the gauge
glass to get a more accurate reading of the water level in the boiler
When a boiler is being inspected, the two main steam stop valves are: - Answer-closed,
locked, and tagged
Closer control of boiler water chemical concentrations is maintained by - Answer-
continuous blowdowns
Chemicals added to the boiler water change the scale-forming salts into a ___ -
Answer-non-adhering sludge
A Three-element feed water regulator regulates the amount of feed water by measuring:
- Answer-The steam flow out of the boiler, feed water flow into the boiler and water level
in the boiler.
___ is the process of removing water from a boiler near the NOWL to control the
quantity of impurities in the remaining water. - Answer-surface blowdown
What does it mean to drop the fusible plug? - Answer-It means you melted the fusible
plug
What is located on the water column to keep sludge and sediment from building inside?
- Answer-Blowdown valve
,On a PH scale, what is a 7 considered? Also what is higher and lower than 7
considered? - Answer-7= Neutral
Higher= Caustic
Lower= Acidic
A mercury-tube pressure control will only be accurate when it is installed - Answer-in a
vertical position
To eliminate the danger of a furnace explosion during start-up, the firing sequence must
first allow for: - Answer-a pre-purge period
The positioning combustion control system used on older boilers can't function without -
Answer-Air pressure(Pneumatic)
What is the purpose of the lower section of the water column? - Answer-Sediment
chamber
When cutting in a boiler equipped with a hand-operated main steam valve in on-line, the
steam pressure on the incoming boiler should be: - Answer-Slightly lower than the line
pressure
What is a high pressure boiler? - Answer-Operates over 15 psi, 6+ BHP
Where do the gases of combustion pass in a water tube boiler? - Answer-around the
tubes
A sudden drop in boiler steam pressure without a corresponding drop in boiler water
temperature could result in: - Answer-a boiler explosion
What is the pressure at which the density of water and steam are the same? - Answer-
Critical pressure
A horizontal return tubular (HRT) boiler is a ___ boiler. - Answer-firetube
A manual reset valve is a ___ valve that remains open as long as the electrical coil is
energized. - Answer-solenoid
Bituminous coal has a high ____ content. - Answer-volatile
Anthracite coal has a high ____ content. - Answer-Carbon
Duplex strainers are found on ____ of the fuel oil pumps. - Answer-Suction and
discharge side
The four systems required to operate a steam boiler are ___. - Answer-steam,
feedwater, fuel, and draft
, When testing a safety valve by hand, you must: - Answer-Have at least 75% of popping
pressure
An automatic non-return valve should be opened during start up when the steam
pressure on the boiler reaches: - Answer-75-85% of the line pressure
What does an accumulation test do? - Answer-It tests the relief capacity of the boiler
safety valves
An ___ heats feed water by passing it through a heat exchanger placed in the path of
the gases of combustion. - Answer-Economizer
A British Thermal unit is a measurement of the quantity of heat required to raise the
temperature of ____ of water by ____ - Answer-1 LB , 1 F
The sequence of three numbers (4x2x4) found on a data plate of a reciprocating feed
water pump indicates the: - Answer-(4) Diameter of a steam piston, (2) Diameter of a
Water Piston, (4)Length of the pump stroke
The metering combustion control system is sensitive to changes in: - Answer-steam
flow and pressure
____ point is the lowest temperature at which liquid will flow from one container to
another. - Answer-pour
The pressure at the base of a vertical foot of water is: - Answer-.433 psi
____ contribute to the overall efficiency of a steam plant by the removal of air and
condensate from steam lines and heat exchangers. - Answer-Steam traps
Three types of heat transfer are: - Answer-conduction, convection, radiation
Following flame failure, controls must de-energize fuel and ignition circuits within: -
Answer-4 seconds
In order to burn 1LB of fuel ___ LB(s) of air are needed. - Answer-15, this applies to a
fuel types
If a quick-opening valve is used as a bottom blowdown valve, it must be located -
Answer-between the boiler and the slow-opening (screw-type) valve
What can steam separators do? What can't they do? - Answer-Do: Conserve energy of
steam, prevent water hammer, and protect equipment from water impingement
Don't: Add heat to the system
