P99 LOW PRESSURE BOILERS
CH. 5 EXPECTED QUESTIONS AND
CORRECT ANSWERS
When burning No.6 fuel oil, the strainers should be
cleaned at least once every _____ hours.
24
When cleaning a fuel oil strainer, the ____ must be
carefully replaced to prevent air from entering the
system.
gasket
The ____ pump draws fuel oil from the fuel oil tank.
fuel oil
The _____ valve protects the fuel lines and pump from
excessive pressure.
relief
A high vacuum on fuel oil suction gauge normally
indicates ________ .
cold fuel or a dirty strainer
Fuel oil burners are designed to provide fuel oil to the
furnace in a ______ .
fine spray
The rotary cup burner uses ______ to atomize the fuel
oil.
a spinning cup and high velocity air
In a low pressure gas burner, gas is mixed with air in
the ____________ .
mixing chamber before the burner register
, In a high pressure gas burner, the gas mixes with the
air on the inside of the ________ .
burner
A ____ is a narrowed portion of the tube.
venturi
On a low pressure gas system, the manual reset
cannot be opened until the _________ .
pilot is lit
________ coal is a hard coal.
Anthracite
In a high pressure gas system, the plant pressure
________ valve reduces gas pressure to the line
pressure used in the system.
regulating
_______ coal is coal that is ground to a fine powder.
Pulverized
A _______ is a mechanical device for feeding coal
consistently to the burner.
stoker
A(n) _______ is an air pressure-activated switch that
closes after proving sufficient pressure of
combination air from the forced draft fan.
air proving switch
A combination burner allows the operator to switch
fuels ___________ .
for economy, if there is a shortage of a fuel, if there is a
failure in the fuel system being used
Hard coal is __________ .
anthracite coal with a high carbon content
Soft coal is ______________.
bituminous coal with a high volatile content
CH. 5 EXPECTED QUESTIONS AND
CORRECT ANSWERS
When burning No.6 fuel oil, the strainers should be
cleaned at least once every _____ hours.
24
When cleaning a fuel oil strainer, the ____ must be
carefully replaced to prevent air from entering the
system.
gasket
The ____ pump draws fuel oil from the fuel oil tank.
fuel oil
The _____ valve protects the fuel lines and pump from
excessive pressure.
relief
A high vacuum on fuel oil suction gauge normally
indicates ________ .
cold fuel or a dirty strainer
Fuel oil burners are designed to provide fuel oil to the
furnace in a ______ .
fine spray
The rotary cup burner uses ______ to atomize the fuel
oil.
a spinning cup and high velocity air
In a low pressure gas burner, gas is mixed with air in
the ____________ .
mixing chamber before the burner register
, In a high pressure gas burner, the gas mixes with the
air on the inside of the ________ .
burner
A ____ is a narrowed portion of the tube.
venturi
On a low pressure gas system, the manual reset
cannot be opened until the _________ .
pilot is lit
________ coal is a hard coal.
Anthracite
In a high pressure gas system, the plant pressure
________ valve reduces gas pressure to the line
pressure used in the system.
regulating
_______ coal is coal that is ground to a fine powder.
Pulverized
A _______ is a mechanical device for feeding coal
consistently to the burner.
stoker
A(n) _______ is an air pressure-activated switch that
closes after proving sufficient pressure of
combination air from the forced draft fan.
air proving switch
A combination burner allows the operator to switch
fuels ___________ .
for economy, if there is a shortage of a fuel, if there is a
failure in the fuel system being used
Hard coal is __________ .
anthracite coal with a high carbon content
Soft coal is ______________.
bituminous coal with a high volatile content
