P99 LOW PRESSURE BOILERS
CH. 1 EXPECTED QUESTIONS AND
CORRECT ANSWERS
What is necessary to generate steam in a boiler?
A container, water and heat.
What part of the boiler has water on one side and heat
on the other?
The heating surface.
What type of boiler has heat and gases of combustion
that pass through tubes surrounded by water?
A fire-tube boiler.
What type of boiler has water in the tubes and heat
and gases of combustion passing around the tubes?
A watertube boiler.
What is used in boilers to direct the gases of
combustion over the boiler heating surface?
Baffles
Sensible heat is heat that __________ ?
Can be measured with a thermometer.
What is used to transfer heat from one substance to
another without allowing the materials to mix?
A heat exchanger
In the _________ , air mixes with fuel and burns.
Combustion chamber.
________ combustion is combustion that occurs when
fuel is burned using only theoretical amount of air?
Perfect
, _________ air is air supplied to a burner above the
theoretical amount required to burn the fuel to ensure
complete combustion.
Excess
The breaking up of fuel into small particles to
maximize contact of fuel with air for combustion is
___________ ?
Atomization
What type of system provides the air necessary for
combustion?
A draft system.
What is the highest pressure in pounds per square
inch at which a boiler can be safely operated?
MAWP
What type of boiler does not use tubes?
Cast iron
What is done to increase the efficiency of the boiler?
The heating surface is increased.
What are the four systems necessary to operate a
boiler?
Feedwater, fuel, draft, and steam.
________ pressure is the pressure caused by the
weight of air surrounding the earth.
Atmospheric
Name three things a boiler does during operation.
Holds water, transfers heat to the water to produce steam,
and collects the steam that is produced.
At what temperature does water turn to steam at
atmospheric pressure?
212 degrees Fahrenheit.
CH. 1 EXPECTED QUESTIONS AND
CORRECT ANSWERS
What is necessary to generate steam in a boiler?
A container, water and heat.
What part of the boiler has water on one side and heat
on the other?
The heating surface.
What type of boiler has heat and gases of combustion
that pass through tubes surrounded by water?
A fire-tube boiler.
What type of boiler has water in the tubes and heat
and gases of combustion passing around the tubes?
A watertube boiler.
What is used in boilers to direct the gases of
combustion over the boiler heating surface?
Baffles
Sensible heat is heat that __________ ?
Can be measured with a thermometer.
What is used to transfer heat from one substance to
another without allowing the materials to mix?
A heat exchanger
In the _________ , air mixes with fuel and burns.
Combustion chamber.
________ combustion is combustion that occurs when
fuel is burned using only theoretical amount of air?
Perfect
, _________ air is air supplied to a burner above the
theoretical amount required to burn the fuel to ensure
complete combustion.
Excess
The breaking up of fuel into small particles to
maximize contact of fuel with air for combustion is
___________ ?
Atomization
What type of system provides the air necessary for
combustion?
A draft system.
What is the highest pressure in pounds per square
inch at which a boiler can be safely operated?
MAWP
What type of boiler does not use tubes?
Cast iron
What is done to increase the efficiency of the boiler?
The heating surface is increased.
What are the four systems necessary to operate a
boiler?
Feedwater, fuel, draft, and steam.
________ pressure is the pressure caused by the
weight of air surrounding the earth.
Atmospheric
Name three things a boiler does during operation.
Holds water, transfers heat to the water to produce steam,
and collects the steam that is produced.
At what temperature does water turn to steam at
atmospheric pressure?
212 degrees Fahrenheit.
