G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
G2 & GAS TECHNICIAN G2 EXAM 3/ G2 & GAS TECHNICIAN G2 EXAM 3
PREPARATION /G2 & GAS TECHNICIAN G2 PRACTICE EXAM 3 NEWEST
2025/2026 COMPLETE 150 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |BRAND NEW VERSION!!
When the voltage has been determine to be approximately 120 volts, which scale
on an analog meter should be selected for most accuracy?
a) 0-30 volts
b) 0-125 volts
c) 0-250 volts
d) 0-600 volts - Correct Answer-c) 0-250 volts
The resistance of a thermistor ... as its temperature rises:
a) Increases,
b) Decreases,
c) Remains the same,
d) Fluctuates. - Correct Answer-b) Decreases,
A hot surface igniter requires how many volts to operate properly.
a) 24 to 30 mV,
b) 24 to 30 mV,
c) 115 to 125 VAC,
d) 190 to 240 VAC. - Correct Answer-c) 115 to 125 VAC,
1|Page
, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
It is permissible to use gas piping as an electrical ground if:
a) The piping is 1 inch in diameter or larger,
b) The piping has welded joints,
c) The voltage is less than 120 volts,
d) It is used in the flame safeguard circuit. - Correct Answer-d) It is used in the
flame safeguard circuit.
A thermopile or powerpile generates:
a) 0 to 20 millivolts,
b) 20 to 30 millivolts,
c) 30 to 90 millivolts,
d) Hundreds of millivolts. - Correct Answer-d) Hundreds of millivolts.
How is the heat anticipator setting determined for a thermostat with an
adjustable anticipator?
a) By the supply air temperature,
b) By measuring the current drawn by the components in the circuit being feed
directly by the thermostat,
c) By the current rating stamped on the gas valve,
d) By the VA rating of the 24 volt control transformer. - Correct Answer-b) By
measuring the current drawn by the components in the circuit being feed directly
by the thermostat,
A fan control is a:
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, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
a) Normally open temperature control that closes on temperature rise,
b) Normally open temperature control that opens on temperature fall,
c) Normally closed temperature control that opens on temperature rise,
d) Normally closed temperature control that opens on temperature rise. - Correct
Answer-a) Normally open temperature control that closes on temperature rise,
As the temperature of a thermistor increases, the current flow through it ...
a) increases,
b) Decreases,
c) Remains the same,
d) Fluctuates. - Correct Answer-a) increases,
A thermostat with a single mercury bulb which controls a single stage
heat, single stage cool unit is a ... control
a) SPST (single pole single throw),
b) SPDT (single pole double throw),
c) DPST (double pole single throw),
d) DPDT (double pole double throw). - Correct Answer-b) SPDT (single pole double
throw),
A thermostat serving a unit which has separate heating and cooling control
transformers
and has one stage of heating and one stage of cooling is a ... control.
a) SPST,
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, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
b) SPDT,
c) DPST,
d) DPDT. - Correct Answer-d) DPDT.
Separate heating and cooling, therefore double pole and double stage for heating
and cooling therefore double throw. Which of the following heating systems
would be
expected to cause problems due to the "distribution effect"?
a) A direct vent furnace,
b) A convectional vent type boiler,
c) A forced air furnace with no return air openings in the furnace room,
d) A forced air furnace with a return air opening in the furnace room. - Correct
Answer-d) A forced air furnace with a return air opening in the furnace room.
The recommended range of relative humidity in a house to control indoor air
contaminates, increase comfort, and maintain the structural integrity of the house
is:
a) 0% to 20%
b) 30% to 50%
c) 60% to 80%
d) 90% to 100% - Correct Answer-b) 30% to 50%
33.From the following list, which action will have the greatest effect on reducing
mold growth in a house?
4|Page
G2 & GAS TECHNICIAN G2 EXAM 3/ G2 & GAS TECHNICIAN G2 EXAM 3
PREPARATION /G2 & GAS TECHNICIAN G2 PRACTICE EXAM 3 NEWEST
2025/2026 COMPLETE 150 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |BRAND NEW VERSION!!
When the voltage has been determine to be approximately 120 volts, which scale
on an analog meter should be selected for most accuracy?
a) 0-30 volts
b) 0-125 volts
c) 0-250 volts
d) 0-600 volts - Correct Answer-c) 0-250 volts
The resistance of a thermistor ... as its temperature rises:
a) Increases,
b) Decreases,
c) Remains the same,
d) Fluctuates. - Correct Answer-b) Decreases,
A hot surface igniter requires how many volts to operate properly.
a) 24 to 30 mV,
b) 24 to 30 mV,
c) 115 to 125 VAC,
d) 190 to 240 VAC. - Correct Answer-c) 115 to 125 VAC,
1|Page
, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
It is permissible to use gas piping as an electrical ground if:
a) The piping is 1 inch in diameter or larger,
b) The piping has welded joints,
c) The voltage is less than 120 volts,
d) It is used in the flame safeguard circuit. - Correct Answer-d) It is used in the
flame safeguard circuit.
A thermopile or powerpile generates:
a) 0 to 20 millivolts,
b) 20 to 30 millivolts,
c) 30 to 90 millivolts,
d) Hundreds of millivolts. - Correct Answer-d) Hundreds of millivolts.
How is the heat anticipator setting determined for a thermostat with an
adjustable anticipator?
a) By the supply air temperature,
b) By measuring the current drawn by the components in the circuit being feed
directly by the thermostat,
c) By the current rating stamped on the gas valve,
d) By the VA rating of the 24 volt control transformer. - Correct Answer-b) By
measuring the current drawn by the components in the circuit being feed directly
by the thermostat,
A fan control is a:
2|Page
, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
a) Normally open temperature control that closes on temperature rise,
b) Normally open temperature control that opens on temperature fall,
c) Normally closed temperature control that opens on temperature rise,
d) Normally closed temperature control that opens on temperature rise. - Correct
Answer-a) Normally open temperature control that closes on temperature rise,
As the temperature of a thermistor increases, the current flow through it ...
a) increases,
b) Decreases,
c) Remains the same,
d) Fluctuates. - Correct Answer-a) increases,
A thermostat with a single mercury bulb which controls a single stage
heat, single stage cool unit is a ... control
a) SPST (single pole single throw),
b) SPDT (single pole double throw),
c) DPST (double pole single throw),
d) DPDT (double pole double throw). - Correct Answer-b) SPDT (single pole double
throw),
A thermostat serving a unit which has separate heating and cooling control
transformers
and has one stage of heating and one stage of cooling is a ... control.
a) SPST,
3|Page
, G2 & Gas Technician G2 Exam 3/ G2 & Gas Technician G2 Exam 3 Preparation
b) SPDT,
c) DPST,
d) DPDT. - Correct Answer-d) DPDT.
Separate heating and cooling, therefore double pole and double stage for heating
and cooling therefore double throw. Which of the following heating systems
would be
expected to cause problems due to the "distribution effect"?
a) A direct vent furnace,
b) A convectional vent type boiler,
c) A forced air furnace with no return air openings in the furnace room,
d) A forced air furnace with a return air opening in the furnace room. - Correct
Answer-d) A forced air furnace with a return air opening in the furnace room.
The recommended range of relative humidity in a house to control indoor air
contaminates, increase comfort, and maintain the structural integrity of the house
is:
a) 0% to 20%
b) 30% to 50%
c) 60% to 80%
d) 90% to 100% - Correct Answer-b) 30% to 50%
33.From the following list, which action will have the greatest effect on reducing
mold growth in a house?
4|Page
