1|Page
G2 EXAM PREPARATION VERSION 2 NEWEST 2026/2027
COMPLETE 300 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||JUST OUT!!!
After welding is completed in an area where combustibles
material is present, how long shall a fire watch be maintained -
ANSWER-30 mins
What is used to remove the start winding from operation when
the motor reaches approximately 75% of normal operating
speed - ANSWER-A solid state relay
What is the expected steady state of a unvented space heater -
ANSWER-90.50%
What step my best completed when checking the high limit
operation on a conventional furnace with a fan center installed -
ANSWER-Blower belt must be removed
What is done to keep air balanced in the building - ANSWER-
Make sure the amount of air entering the building is the same
as the amount exiting
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The electrical service applied to a building is measured in what
units - ANSWER-Amperes
The minimum allowable distance to be maintained from a
50,000 btu water heater flue outlet to a gas utility service
regulator vent opening is - ANSWER-3ft
The minimum closed circuit test reading of a thermocouple
should be - ANSWER-10mv
Increasings the burners air supply will have the following effect
on the percentage of co2 in the flue gas and stack temp -
ANSWER-The co2 will decrease and the stack temp will increase
The resistance of a wire___________ as it temperature rises -
ANSWER-Increases
The flue and ventilation effect in a building causes - ANSWER-
Infiltration of air to replace that which exhausted through vents
and exhaust devices
The lower the return air temp to the air handler on a combo
unit employing a water heater to supply domestic hot water
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and space heating - ANSWER-The higher heating output from
the air handler
When air is heated - ANSWER-It's relative humidity decreases
Convection is the - ANSWER-Heat transfer through fluids
A depressurization test will determine - ANSWER-Potential for
pressure induced backdrafting in the house
If the bypass valve on a pool heater is closed - ANSWER-The flue
gas May condense
The most accurate way to determine the amount of propane in
a large storage tank is by the use of - ANSWER-A ROTO gauge or
slip tube gauge
Temperature compensated meters are installed to - ANSWER-
Provide accurate measurements in varying weather conditions
What additional cleaning must be done of untreated water that
is used in a cooling medium - ANSWER-Scale must be removed
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What control load responds to a load change on a hydronic
heater system - ANSWER-Aquastat
What controls moisture level indoors - ANSWER-Mechanical
equipment
A retrofit kid efficiency is sized according to - ANSWER-The heat
loss of a residence
What can loose wiring cause - ANSWER-Increases resistance
What damage could occur to a system that includes an add on
a/c due to a dirty filter - ANSWER-Decrease operational
pressures causing flood back which can damage compressor
system
Head pressure in a piping system for water heating is -
ANSWER-The resistance of the entire piping system measure in
feet of piping
G2 EXAM PREPARATION VERSION 2 NEWEST 2026/2027
COMPLETE 300 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||JUST OUT!!!
After welding is completed in an area where combustibles
material is present, how long shall a fire watch be maintained -
ANSWER-30 mins
What is used to remove the start winding from operation when
the motor reaches approximately 75% of normal operating
speed - ANSWER-A solid state relay
What is the expected steady state of a unvented space heater -
ANSWER-90.50%
What step my best completed when checking the high limit
operation on a conventional furnace with a fan center installed -
ANSWER-Blower belt must be removed
What is done to keep air balanced in the building - ANSWER-
Make sure the amount of air entering the building is the same
as the amount exiting
,2|Page
The electrical service applied to a building is measured in what
units - ANSWER-Amperes
The minimum allowable distance to be maintained from a
50,000 btu water heater flue outlet to a gas utility service
regulator vent opening is - ANSWER-3ft
The minimum closed circuit test reading of a thermocouple
should be - ANSWER-10mv
Increasings the burners air supply will have the following effect
on the percentage of co2 in the flue gas and stack temp -
ANSWER-The co2 will decrease and the stack temp will increase
The resistance of a wire___________ as it temperature rises -
ANSWER-Increases
The flue and ventilation effect in a building causes - ANSWER-
Infiltration of air to replace that which exhausted through vents
and exhaust devices
The lower the return air temp to the air handler on a combo
unit employing a water heater to supply domestic hot water
,3|Page
and space heating - ANSWER-The higher heating output from
the air handler
When air is heated - ANSWER-It's relative humidity decreases
Convection is the - ANSWER-Heat transfer through fluids
A depressurization test will determine - ANSWER-Potential for
pressure induced backdrafting in the house
If the bypass valve on a pool heater is closed - ANSWER-The flue
gas May condense
The most accurate way to determine the amount of propane in
a large storage tank is by the use of - ANSWER-A ROTO gauge or
slip tube gauge
Temperature compensated meters are installed to - ANSWER-
Provide accurate measurements in varying weather conditions
What additional cleaning must be done of untreated water that
is used in a cooling medium - ANSWER-Scale must be removed
, 4|Page
What control load responds to a load change on a hydronic
heater system - ANSWER-Aquastat
What controls moisture level indoors - ANSWER-Mechanical
equipment
A retrofit kid efficiency is sized according to - ANSWER-The heat
loss of a residence
What can loose wiring cause - ANSWER-Increases resistance
What damage could occur to a system that includes an add on
a/c due to a dirty filter - ANSWER-Decrease operational
pressures causing flood back which can damage compressor
system
Head pressure in a piping system for water heating is -
ANSWER-The resistance of the entire piping system measure in
feet of piping
