1|Page
NATE Gas & Heat Newest Exam 2025-2026 / NATE
Gas & Heat Preparation/NATE Gas & Heat Exam
Practice Exam With 500 Questions And Correct
Answers| Brand New Version!
The sensor of an electronic leak detector can be affected by _____,
which may cause the instrument to give a false indication of a gas leak.
a. cutting oil
b. moisture
c. pipe sealant
d. Teflon tape - ANSWER-c
What is the minimum diameter for condensate drain piping?
a. 1/2 in.
b. 3/4 in.
c. 1 in.
d. 1 1/4 in. - ANSWER-b
Generally speaking, a residential thermostat should be mounted _____.
a. approximately 5 ft off the floor
b. in the kitchen
c. near a supply register
,2|Page
d. on an exterior wall - ANSWER-a
Which is the proper terminal for heating on most thermostats?
a. C
b. G
c. W
d. Y - ANSWER-c
On an auto changeover thermostat, the difference between the heating
and cooling setpoints (that keeps the equipment from cycling back and
forth between heating and cooling) is known as the _____.
a. deadband
b. droop
c. offset
d. throttling range - ANSWER-a
In order to prevent condensation from forming in the heat exchanger of a
furnace, the cooling coil should always be mounted ______.
a. above the heat exchanger
b. below the heat exchanger
c. downstream from the heat exchanger
d. upstream from the heat exchanger - ANSWER-c
,3|Page
In the summer months, the damper on a bypass humidifier should be
_____.
a. fully closed
b. fully open
c. partially open
d. removed - ANSWER-a
Which of the following is NOT true of a residential zoned system?
a. Each zone has its own temperature control
b. There can be no more than four zones within a single structure
c. Zoned units may use a bypass damper to pass excess supply air to the
return duct
d. Zoned units may use a dump damper to pass excess supply air to a
non-critical area - ANSWER-b
A type of equipment that uses outside air to provide "free" cooling
during mild conditions is known as a(n) ______.
a. economizer
b. energy recovery ventilator
c. fresh air intake
d. heat recovery ventilator - ANSWER-a
, 4|Page
A type of equipment that transfers both latent and sensible heat from the
exhaust air to the supply air is known as a(n) _____.
a. economizer
b. energy recovery ventilator
c. fresh air intake
d. heat recovery ventilator - ANSWER-b
A standing pilot furnace with an atmospheric burner is an example of a
_____ gas appliance.
a. Category I
b. Category II
c. Category III
d. Category IV - ANSWER-a
A high-efficiency condensing furnace is an example of a _____ gas
appliance.
a. Category I
b. Category II
c. Category III
d. Category IV - ANSWER-d
When two Category I appliances vent into a common flue, the common
flue is sized to be equal to the ______.
NATE Gas & Heat Newest Exam 2025-2026 / NATE
Gas & Heat Preparation/NATE Gas & Heat Exam
Practice Exam With 500 Questions And Correct
Answers| Brand New Version!
The sensor of an electronic leak detector can be affected by _____,
which may cause the instrument to give a false indication of a gas leak.
a. cutting oil
b. moisture
c. pipe sealant
d. Teflon tape - ANSWER-c
What is the minimum diameter for condensate drain piping?
a. 1/2 in.
b. 3/4 in.
c. 1 in.
d. 1 1/4 in. - ANSWER-b
Generally speaking, a residential thermostat should be mounted _____.
a. approximately 5 ft off the floor
b. in the kitchen
c. near a supply register
,2|Page
d. on an exterior wall - ANSWER-a
Which is the proper terminal for heating on most thermostats?
a. C
b. G
c. W
d. Y - ANSWER-c
On an auto changeover thermostat, the difference between the heating
and cooling setpoints (that keeps the equipment from cycling back and
forth between heating and cooling) is known as the _____.
a. deadband
b. droop
c. offset
d. throttling range - ANSWER-a
In order to prevent condensation from forming in the heat exchanger of a
furnace, the cooling coil should always be mounted ______.
a. above the heat exchanger
b. below the heat exchanger
c. downstream from the heat exchanger
d. upstream from the heat exchanger - ANSWER-c
,3|Page
In the summer months, the damper on a bypass humidifier should be
_____.
a. fully closed
b. fully open
c. partially open
d. removed - ANSWER-a
Which of the following is NOT true of a residential zoned system?
a. Each zone has its own temperature control
b. There can be no more than four zones within a single structure
c. Zoned units may use a bypass damper to pass excess supply air to the
return duct
d. Zoned units may use a dump damper to pass excess supply air to a
non-critical area - ANSWER-b
A type of equipment that uses outside air to provide "free" cooling
during mild conditions is known as a(n) ______.
a. economizer
b. energy recovery ventilator
c. fresh air intake
d. heat recovery ventilator - ANSWER-a
, 4|Page
A type of equipment that transfers both latent and sensible heat from the
exhaust air to the supply air is known as a(n) _____.
a. economizer
b. energy recovery ventilator
c. fresh air intake
d. heat recovery ventilator - ANSWER-b
A standing pilot furnace with an atmospheric burner is an example of a
_____ gas appliance.
a. Category I
b. Category II
c. Category III
d. Category IV - ANSWER-a
A high-efficiency condensing furnace is an example of a _____ gas
appliance.
a. Category I
b. Category II
c. Category III
d. Category IV - ANSWER-d
When two Category I appliances vent into a common flue, the common
flue is sized to be equal to the ______.
