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HEATING SERVICE QUESTIONS WITH
DETAILED VERIFIED ANSWERS
10,000 volts a/c Ans: On a oil furnace the ignition transformer takes
120 volts AC and transforms it into _____________________ to ignite
the oil droplets.
lift off the burner Ans: If too much primary air is used the flame will
_______ .
the expansion tank being water logged Ans: A boiler pressure relief
valve that is dispensing intermittently is most likely caused by
___________.
Heat call from the thermostat.
Control board does a safety check (limit switches, roll out switches).
Inducer motor comes on.
Pressure switch must close to go to the next step.
Hot surface ignitor begins getting hot / direct spark ignitor begins to
spark
Gas Valve opens
Furnace Lights
Flame Sensor senses flame
30 seconds - 1 minute blower motor comes on.
Once thermostat is satisfied, the burner shuts off Ans: What is the
sequence of operation for a gas fired furnace ?
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C= (F-32) x (5/9 or .56) Ans: 70 degrees Fahrenheit is equivalent to
_____ degrees Celsius.
F= (C x 9/5) + 32 (9/5 = 1.8) Ans: 28 degrees Celsius is equivalent to
_____ degrees Fahrenheit.
15 pounds Ans: On a low pressure residential steam boiler the relief
device opens at ?
24 volts a/c Ans: What operates the heat anticipator in a low voltage
thermostat ?
Either the 24 or 120-volt circuit Ans: A limit control is located where in
the electrical circuit ?
100 psig Ans: What is the usual oil pressure at the nozzle in a
high-pressure gun type oil burner ?
Mechanical Contractor Category 6 Ans: What license is required to
perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU ?
Psychrometer Ans: A hygrometer consisting of a wet-bulb and dry-bulb
thermometer, the difference in the two readings used to determine the
atmospheric humidity is a __________ .
Psychrometric chart Ans: A chart where the various property of air are
plotted is a ____________ .
Chemical Ans: Combustion is what type of process ?
21 Ans: What percentage of the air is oxygen ?
burner and pilot. Ans: A hand shut off valve in a gas line is used to turn
gas on and off to the _______.
combination gas valve. Ans: CGV is the abbreviation for ___________.
3 Ans: The maximum safety drop out time for a thermo-couple is
___________ minutes.
HEATING SERVICE QUESTIONS WITH
DETAILED VERIFIED ANSWERS
10,000 volts a/c Ans: On a oil furnace the ignition transformer takes
120 volts AC and transforms it into _____________________ to ignite
the oil droplets.
lift off the burner Ans: If too much primary air is used the flame will
_______ .
the expansion tank being water logged Ans: A boiler pressure relief
valve that is dispensing intermittently is most likely caused by
___________.
Heat call from the thermostat.
Control board does a safety check (limit switches, roll out switches).
Inducer motor comes on.
Pressure switch must close to go to the next step.
Hot surface ignitor begins getting hot / direct spark ignitor begins to
spark
Gas Valve opens
Furnace Lights
Flame Sensor senses flame
30 seconds - 1 minute blower motor comes on.
Once thermostat is satisfied, the burner shuts off Ans: What is the
sequence of operation for a gas fired furnace ?
, Page | 2
C= (F-32) x (5/9 or .56) Ans: 70 degrees Fahrenheit is equivalent to
_____ degrees Celsius.
F= (C x 9/5) + 32 (9/5 = 1.8) Ans: 28 degrees Celsius is equivalent to
_____ degrees Fahrenheit.
15 pounds Ans: On a low pressure residential steam boiler the relief
device opens at ?
24 volts a/c Ans: What operates the heat anticipator in a low voltage
thermostat ?
Either the 24 or 120-volt circuit Ans: A limit control is located where in
the electrical circuit ?
100 psig Ans: What is the usual oil pressure at the nozzle in a
high-pressure gun type oil burner ?
Mechanical Contractor Category 6 Ans: What license is required to
perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU ?
Psychrometer Ans: A hygrometer consisting of a wet-bulb and dry-bulb
thermometer, the difference in the two readings used to determine the
atmospheric humidity is a __________ .
Psychrometric chart Ans: A chart where the various property of air are
plotted is a ____________ .
Chemical Ans: Combustion is what type of process ?
21 Ans: What percentage of the air is oxygen ?
burner and pilot. Ans: A hand shut off valve in a gas line is used to turn
gas on and off to the _______.
combination gas valve. Ans: CGV is the abbreviation for ___________.
3 Ans: The maximum safety drop out time for a thermo-couple is
___________ minutes.
