NATE Gas Exam Preparation Version 3 Newest 2026-
2027 With Complete Questions And Correct Detailed
Answers| Brand New Version!
Heat always moves to equalize temperature. Convection moves warmer
air to the ceiling as it is added to the space which causes: - ANSWER-
The temperature in the rooms not to be the same.
Heat exchangers are typically sealed: - ANSWER-In the furnace housing
by gaskets.
How many elbows and joints should a vent connector have: - ANSWER-
As few as possible.
How may a technician terminate the intake and exhaust for proper
operation of a high efficiency gas furnace when using scheduled 40 PVC
pipe: - ANSWER-By using the specific manufacturers termination kit or
make one to meet their requirements.
How much of the end of the thermocouple should be enveloped by the
pilot flame: - ANSWER-3/8 to 1/2 inch
1|Page
,If too much primary air is used the flame will: - ANSWER-Lift off the
burner.
In order to ensure proper combustion air is available in a crawlspace
application of a direct vent gas furnace there must be an: - ANSWER-Air
intake connected from the outside to the furnace combustion air
opening.
In the sequence of operation of an induced draft, intermittent pilot gas
furnace: - ANSWER-The induced draft motor starts when the
thermostat calls for heat.
Inadequate system airflow will cause a: - ANSWER-Temperature
differential across the heat exchanger that exceeds the manufacturers
rating plate.
Induced draft blowers in direct vent condensing furnaces pull: -
ANSWER-Outside combustion air only.
Leak detecting solutions specially formulated for use on gas piping are: -
ANSWER-Preferred over household soap because house solutions are
more expensive.
Leveling of a Mercury bulb is: - ANSWER-Critical
2|Page
, Motor horsepower is one of the criteria used when: - ANSWER-
Selecting a replacement indoor blower motor.
No mechanical fasteners should be used to install - ANSWER-Floor
diffusers in boots or register boxes
On a 20 amp (FLA) motor the minimum circuit ampacity (MCA) should
be: - ANSWER-25 amps
On a single stage combination gas valve with a thermocouple flame
proving circuit: - ANSWER-The main burner gas flow is in series with the
pilot gas valve.
Operating sound a consideration in the location of a heating unit
because: - ANSWER-Excessive noise could be disruptive to the
customer.
Primary air is mixed with the gas within the: - ANSWER-Burner head.
Prior to performing an air balancing check of a newly installed duct
system: - ANSWER-Dampers should be open completely in all rooms.
3|Page
2027 With Complete Questions And Correct Detailed
Answers| Brand New Version!
Heat always moves to equalize temperature. Convection moves warmer
air to the ceiling as it is added to the space which causes: - ANSWER-
The temperature in the rooms not to be the same.
Heat exchangers are typically sealed: - ANSWER-In the furnace housing
by gaskets.
How many elbows and joints should a vent connector have: - ANSWER-
As few as possible.
How may a technician terminate the intake and exhaust for proper
operation of a high efficiency gas furnace when using scheduled 40 PVC
pipe: - ANSWER-By using the specific manufacturers termination kit or
make one to meet their requirements.
How much of the end of the thermocouple should be enveloped by the
pilot flame: - ANSWER-3/8 to 1/2 inch
1|Page
,If too much primary air is used the flame will: - ANSWER-Lift off the
burner.
In order to ensure proper combustion air is available in a crawlspace
application of a direct vent gas furnace there must be an: - ANSWER-Air
intake connected from the outside to the furnace combustion air
opening.
In the sequence of operation of an induced draft, intermittent pilot gas
furnace: - ANSWER-The induced draft motor starts when the
thermostat calls for heat.
Inadequate system airflow will cause a: - ANSWER-Temperature
differential across the heat exchanger that exceeds the manufacturers
rating plate.
Induced draft blowers in direct vent condensing furnaces pull: -
ANSWER-Outside combustion air only.
Leak detecting solutions specially formulated for use on gas piping are: -
ANSWER-Preferred over household soap because house solutions are
more expensive.
Leveling of a Mercury bulb is: - ANSWER-Critical
2|Page
, Motor horsepower is one of the criteria used when: - ANSWER-
Selecting a replacement indoor blower motor.
No mechanical fasteners should be used to install - ANSWER-Floor
diffusers in boots or register boxes
On a 20 amp (FLA) motor the minimum circuit ampacity (MCA) should
be: - ANSWER-25 amps
On a single stage combination gas valve with a thermocouple flame
proving circuit: - ANSWER-The main burner gas flow is in series with the
pilot gas valve.
Operating sound a consideration in the location of a heating unit
because: - ANSWER-Excessive noise could be disruptive to the
customer.
Primary air is mixed with the gas within the: - ANSWER-Burner head.
Prior to performing an air balancing check of a newly installed duct
system: - ANSWER-Dampers should be open completely in all rooms.
3|Page
