Boiler license Exam Questions and Correct Answers
Because of the large volume of water, the boiler type most likely to cause a boiler
explosion is a ___ boiler. - Answer-firetube
/.The part of a boiler with the heat and gases of combustion on one side and water on
the other side is known as the ___ surface. - Answer-heating
/.___ is the pressure at which the density of water and steam are the same. - Answer-
Critical pressure
/.An electric boiler produces heat using electrodes or ___. - Answer-resistance coils
/.Boiler horsepower (BHP) is the amount of energy equal to the evaporation of ___ lb/hr
of water from and at a feedwater temperature of 212°F. - Answer-34.5
/.A high pressure steam boiler operates at a steam pressure of more than ___ psi. -
Answer-15
/.A ___ results in a higher boiling point for water in a boiler. - Answer-higher steam
pressure
/.A(n) ___ is a boiler that uses heat recovered from a hot gas stream, such as hot
exhaust gases from a kiln or from a gas turbine. - Answer-heat recovery steam
generator (HRSG)
/.A ___ is the lowest part of the water side of a watertube boiler. - Answer-mud drum
/.By increasing the number of passes and the number of fire tubes, water can absorb
more heat and ___ increases. - Answer-thermal efficiency
/.The steam drum of watertube boilers is dished (concave) to eliminate the need for ___.
- Answer-stays
/.___ stress occurs when two forces of equal intensity act from opposite directions and
push toward the center of an object. - Answer-Compressive
/.___ are used to direct the gases of combustion so that they come in close contact with
the boiler heating surface. - Answer-Baffles
/.A ___ is a set of tubes that is placed in the furnace area of watertube boilers and used
to increase the heating surface of boilers and the service life of refractory. - Answer-
waterwall
,/.A ___ boiler comes completely assembled, with its own pressure vessel, burner, draft
fans, and fuel train. - Answer-package
/.Boiler plates and stays are subjected to ___ stress. - Answer-tensile
/.___ are used to prevent bulging in boilers. - Answer-Through stays
/.A ___ converts the energy from the expansion of high-pressure steam into the
mechanical energy of rotation. - Answer-turbine
/.A ___ is a device that converts mechanical energy into electrical energy. - Answer-
generator
/.Cogeneration is the process of ___ and then using the waste heat for heating
buildings, providing process heat, or further electrical generation. - Answer-generating
electricity
/.Food processing plants use steam for ___, pasteurization, and sterilization. - Answer-
cooking
/.___ is the production of electricity as a result of a conductor passing through a
magnetic field. - Answer-Electromagnetic induction
/.___ generators are the most common generators used to produce electrical power. -
Answer-AC
/.___ is often used as a prime mover that is used to rotate turbines to generate
electricity. - Answer-High-pressure steam
/.Exhaust gases from engines and turbines pass through a heat exchanger to produce
hot water or steam for use in plant heating or processes in ___ plants. - Answer-
combined heat and power (CHP)
/.CHAPTER 2 - Answer-
/.___ are used for steam loads that require dry steam. - Answer-Superheaters
/.A ___ can be installed at the point of use to reduce the steam pressure to the pressure
needed for the load. - Answer-pressure-reducing station
/.A ___ is used to send condensate back to the condensate return. - Answer-steam trap
/.Feedwater flows into a boiler to be heated by ___. - Answer-gases of combustion
/.Each steam load device has one or more ___ valves that allow the load device to be
taken out of service for repairs. - Answer-isolation
, /.It takes ___ lb of water to produce 1 lb of steam. - Answer-1.0
/.A deaerator tank is located above the feedwater pumps so that the water is supplied to
the pumps ___. - Answer-at a positive pressure
/.In the deaerator tank, noncondensable gases are separated and directed to the
atmosphere through a ___. - Answer-vent
/.Feedwater can be pumped through a ___ where it is heated to a relatively high
temperature by the gases of combustion. - Answer-closed feedwater heater
/.In the deaerator tank, a ___ to add makeup water to the deaerator tank to compensate
for the condensate lost. - Answer-float opens a feed valve
/.A shutoff valve is used when ___. - Answer-making repairs
/.On larger watertube boilers, a(n) ___ can heat the feedwater by using gases of
combustion before the feedwater enters the boiler. - Answer-economizer
/.Once fuel oil reaches the burner, it is the function of the burner to ___ the oil so it can
mix with air and burn. - Answer-atomize
/.In a low-pressure gas system, the zero gas governor reduces the pressure of the gas
to ___ psi. - Answer-0
/.In a low-pressure gas system, the air and gas mixture in the furnace is ignited by the
___. - Answer-pilot
/.Modern coal plants use ___ coal that is blown into the combustion chamber where it
burns in suspension. - Answer-pulverized
/.___ valves are typically slow-opening, fast-closing, hydraulic-electric valves and
should have an internal proof-of-closure switch. - Answer-Safety shutoff
/.A(n) ___ is used to clean fuel oil before it goes to a burner. - Answer-strainer
/.Stop valves isolate a tank when ___. - Answer-it is not in use
/.Most steam plants that use No. ___ fuel oil have two tanks. - Answer-6
/.In a basic pulverized coal system, the coal ___ stores the coal before it flows onto the
coal conveyor. - Answer-bunker
/.___ draft results from temperature differences between air and gases of combustion
and is produced with a stack only. - Answer-Natural
Because of the large volume of water, the boiler type most likely to cause a boiler
explosion is a ___ boiler. - Answer-firetube
/.The part of a boiler with the heat and gases of combustion on one side and water on
the other side is known as the ___ surface. - Answer-heating
/.___ is the pressure at which the density of water and steam are the same. - Answer-
Critical pressure
/.An electric boiler produces heat using electrodes or ___. - Answer-resistance coils
/.Boiler horsepower (BHP) is the amount of energy equal to the evaporation of ___ lb/hr
of water from and at a feedwater temperature of 212°F. - Answer-34.5
/.A high pressure steam boiler operates at a steam pressure of more than ___ psi. -
Answer-15
/.A ___ results in a higher boiling point for water in a boiler. - Answer-higher steam
pressure
/.A(n) ___ is a boiler that uses heat recovered from a hot gas stream, such as hot
exhaust gases from a kiln or from a gas turbine. - Answer-heat recovery steam
generator (HRSG)
/.A ___ is the lowest part of the water side of a watertube boiler. - Answer-mud drum
/.By increasing the number of passes and the number of fire tubes, water can absorb
more heat and ___ increases. - Answer-thermal efficiency
/.The steam drum of watertube boilers is dished (concave) to eliminate the need for ___.
- Answer-stays
/.___ stress occurs when two forces of equal intensity act from opposite directions and
push toward the center of an object. - Answer-Compressive
/.___ are used to direct the gases of combustion so that they come in close contact with
the boiler heating surface. - Answer-Baffles
/.A ___ is a set of tubes that is placed in the furnace area of watertube boilers and used
to increase the heating surface of boilers and the service life of refractory. - Answer-
waterwall
,/.A ___ boiler comes completely assembled, with its own pressure vessel, burner, draft
fans, and fuel train. - Answer-package
/.Boiler plates and stays are subjected to ___ stress. - Answer-tensile
/.___ are used to prevent bulging in boilers. - Answer-Through stays
/.A ___ converts the energy from the expansion of high-pressure steam into the
mechanical energy of rotation. - Answer-turbine
/.A ___ is a device that converts mechanical energy into electrical energy. - Answer-
generator
/.Cogeneration is the process of ___ and then using the waste heat for heating
buildings, providing process heat, or further electrical generation. - Answer-generating
electricity
/.Food processing plants use steam for ___, pasteurization, and sterilization. - Answer-
cooking
/.___ is the production of electricity as a result of a conductor passing through a
magnetic field. - Answer-Electromagnetic induction
/.___ generators are the most common generators used to produce electrical power. -
Answer-AC
/.___ is often used as a prime mover that is used to rotate turbines to generate
electricity. - Answer-High-pressure steam
/.Exhaust gases from engines and turbines pass through a heat exchanger to produce
hot water or steam for use in plant heating or processes in ___ plants. - Answer-
combined heat and power (CHP)
/.CHAPTER 2 - Answer-
/.___ are used for steam loads that require dry steam. - Answer-Superheaters
/.A ___ can be installed at the point of use to reduce the steam pressure to the pressure
needed for the load. - Answer-pressure-reducing station
/.A ___ is used to send condensate back to the condensate return. - Answer-steam trap
/.Feedwater flows into a boiler to be heated by ___. - Answer-gases of combustion
/.Each steam load device has one or more ___ valves that allow the load device to be
taken out of service for repairs. - Answer-isolation
, /.It takes ___ lb of water to produce 1 lb of steam. - Answer-1.0
/.A deaerator tank is located above the feedwater pumps so that the water is supplied to
the pumps ___. - Answer-at a positive pressure
/.In the deaerator tank, noncondensable gases are separated and directed to the
atmosphere through a ___. - Answer-vent
/.Feedwater can be pumped through a ___ where it is heated to a relatively high
temperature by the gases of combustion. - Answer-closed feedwater heater
/.In the deaerator tank, a ___ to add makeup water to the deaerator tank to compensate
for the condensate lost. - Answer-float opens a feed valve
/.A shutoff valve is used when ___. - Answer-making repairs
/.On larger watertube boilers, a(n) ___ can heat the feedwater by using gases of
combustion before the feedwater enters the boiler. - Answer-economizer
/.Once fuel oil reaches the burner, it is the function of the burner to ___ the oil so it can
mix with air and burn. - Answer-atomize
/.In a low-pressure gas system, the zero gas governor reduces the pressure of the gas
to ___ psi. - Answer-0
/.In a low-pressure gas system, the air and gas mixture in the furnace is ignited by the
___. - Answer-pilot
/.Modern coal plants use ___ coal that is blown into the combustion chamber where it
burns in suspension. - Answer-pulverized
/.___ valves are typically slow-opening, fast-closing, hydraulic-electric valves and
should have an internal proof-of-closure switch. - Answer-Safety shutoff
/.A(n) ___ is used to clean fuel oil before it goes to a burner. - Answer-strainer
/.Stop valves isolate a tank when ___. - Answer-it is not in use
/.Most steam plants that use No. ___ fuel oil have two tanks. - Answer-6
/.In a basic pulverized coal system, the coal ___ stores the coal before it flows onto the
coal conveyor. - Answer-bunker
/.___ draft results from temperature differences between air and gases of combustion
and is produced with a stack only. - Answer-Natural
