NATE GAS HEATING INSTALLATION EXAM COMPLETE
100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND
NEW VERSION!!
1. Which of the following is the correct procedure for installing a gas furnace in a
residential space?
A) Mount the furnace on the floor without additional supports
B) Ensure proper ventilation and clearance according to the manufacturer's
instructions
C) Connect the gas line without checking for leaks
D) Install the furnace in a room without a dedicated vent
Answer: B) Ensure proper ventilation and clearance according to the
manufacturer's instructions
Rationale: Proper ventilation and clearance are critical to ensure safe operation
and prevent overheating or other hazardous conditions.
2. What is the minimum distance required for a gas furnace’s flue pipe from any
combustibles?
A) 1 inch
B) 6 inches
C) 12 inches
D) 18 inches
Answer: B) 6 inches
Rationale: Most local codes require at least 6 inches of clearance to combustibles
for gas appliance flue pipes to prevent fire hazards.
,3. What must be done to a gas line before connecting it to the furnace?
A) Perform a pressure test to check for leaks
B) Install a shutoff valve immediately at the furnace
C) Sandpaper the gas pipe before installation
D) Use Teflon tape on all threaded connections
Answer: A) Perform a pressure test to check for leaks
Rationale: Ensuring that the gas line is free of leaks is vital for safety. A pressure
test verifies the integrity of the gas system before connecting the furnace.
4. When should a gas furnace be installed with a dedicated circuit for electrical
power?
A) Only if it is a high-efficiency model
B) Always, to ensure reliable power and prevent tripping the main breaker
C) Only if the unit requires 240 volts
D) Only if the furnace has an integrated humidifier
Answer: B) Always, to ensure reliable power and prevent tripping the main
breaker
Rationale: A dedicated circuit ensures that the furnace receives the necessary
power without interference from other devices, ensuring safe operation.
5. Which of the following is required for proper gas furnace combustion air
intake?
A) A fresh air intake directly from the outside
B) Use of a room’s air for intake if the furnace is in a sealed environment
C) Installation of a CO2 scrubber for intake air
D) Air from any adjacent room
Answer: A) A fresh air intake directly from the outside
Rationale: Combustion air must be clean and free from contaminants. A direct
,intake from the outside ensures that the furnace has adequate and non-
contaminated air.
6. What is the purpose of a flue gas draft inducer in a gas furnace?
A) To circulate heat throughout the home
B) To push exhaust gases safely out of the home
C) To increase the efficiency of the furnace
D) To prevent the buildup of carbon monoxide
Answer: B) To push exhaust gases safely out of the home
Rationale: The draft inducer ensures that harmful flue gases are safely vented
outside the home to prevent the accumulation of dangerous gases like carbon
monoxide.
7. What is the primary safety feature to check before starting a gas furnace for
the first time after installation?
A) Verify that the thermostat is correctly set
B) Ensure that the gas shut-off valve is in the open position
C) Check that the air filter is installed correctly
D) Ensure that the furnace’s fan motor is lubricated
Answer: B) Ensure that the gas shut-off valve is in the open position
Rationale: The gas shut-off valve must be open before the furnace can operate
safely. It prevents the furnace from receiving gas if it is closed.
8. When installing a gas furnace, why should you avoid using flexible gas
connectors longer than necessary?
A) They may be prone to corrosion
B) They are prone to physical damage
, C) They do not allow proper airflow
D) They are more difficult to install than rigid pipe
Answer: B) They are prone to physical damage
Rationale: Long flexible gas connectors can be susceptible to physical damage,
which could lead to gas leaks or unsafe operation. Keep the connector as short as
possible.
9. What is the primary function of a furnace venting system?
A) To prevent the furnace from overheating
B) To allow hot air to circulate through the home
C) To safely expel combustion gases from the furnace to the outside
D) To return cooled air to the furnace for reheating
Answer: C) To safely expel combustion gases from the furnace to the outside
Rationale: The venting system ensures that the harmful gases produced during
combustion are safely expelled, protecting the indoor air quality.
10. What must be done after installing a gas furnace to ensure it is operating
efficiently?
A) Check the furnace’s ignition system and burner operation
B) Turn off the furnace and restart it after 30 minutes
C) Adjust the fuel mixture to the furnace’s default setting
D) Disconnect the thermostat and test the furnace manually
Answer: A) Check the furnace’s ignition system and burner operation
Rationale: Ensuring that the ignition system and burners are operating properly is
essential for safe and efficient operation. This should always be checked after
installation.
:
100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND
NEW VERSION!!
1. Which of the following is the correct procedure for installing a gas furnace in a
residential space?
A) Mount the furnace on the floor without additional supports
B) Ensure proper ventilation and clearance according to the manufacturer's
instructions
C) Connect the gas line without checking for leaks
D) Install the furnace in a room without a dedicated vent
Answer: B) Ensure proper ventilation and clearance according to the
manufacturer's instructions
Rationale: Proper ventilation and clearance are critical to ensure safe operation
and prevent overheating or other hazardous conditions.
2. What is the minimum distance required for a gas furnace’s flue pipe from any
combustibles?
A) 1 inch
B) 6 inches
C) 12 inches
D) 18 inches
Answer: B) 6 inches
Rationale: Most local codes require at least 6 inches of clearance to combustibles
for gas appliance flue pipes to prevent fire hazards.
,3. What must be done to a gas line before connecting it to the furnace?
A) Perform a pressure test to check for leaks
B) Install a shutoff valve immediately at the furnace
C) Sandpaper the gas pipe before installation
D) Use Teflon tape on all threaded connections
Answer: A) Perform a pressure test to check for leaks
Rationale: Ensuring that the gas line is free of leaks is vital for safety. A pressure
test verifies the integrity of the gas system before connecting the furnace.
4. When should a gas furnace be installed with a dedicated circuit for electrical
power?
A) Only if it is a high-efficiency model
B) Always, to ensure reliable power and prevent tripping the main breaker
C) Only if the unit requires 240 volts
D) Only if the furnace has an integrated humidifier
Answer: B) Always, to ensure reliable power and prevent tripping the main
breaker
Rationale: A dedicated circuit ensures that the furnace receives the necessary
power without interference from other devices, ensuring safe operation.
5. Which of the following is required for proper gas furnace combustion air
intake?
A) A fresh air intake directly from the outside
B) Use of a room’s air for intake if the furnace is in a sealed environment
C) Installation of a CO2 scrubber for intake air
D) Air from any adjacent room
Answer: A) A fresh air intake directly from the outside
Rationale: Combustion air must be clean and free from contaminants. A direct
,intake from the outside ensures that the furnace has adequate and non-
contaminated air.
6. What is the purpose of a flue gas draft inducer in a gas furnace?
A) To circulate heat throughout the home
B) To push exhaust gases safely out of the home
C) To increase the efficiency of the furnace
D) To prevent the buildup of carbon monoxide
Answer: B) To push exhaust gases safely out of the home
Rationale: The draft inducer ensures that harmful flue gases are safely vented
outside the home to prevent the accumulation of dangerous gases like carbon
monoxide.
7. What is the primary safety feature to check before starting a gas furnace for
the first time after installation?
A) Verify that the thermostat is correctly set
B) Ensure that the gas shut-off valve is in the open position
C) Check that the air filter is installed correctly
D) Ensure that the furnace’s fan motor is lubricated
Answer: B) Ensure that the gas shut-off valve is in the open position
Rationale: The gas shut-off valve must be open before the furnace can operate
safely. It prevents the furnace from receiving gas if it is closed.
8. When installing a gas furnace, why should you avoid using flexible gas
connectors longer than necessary?
A) They may be prone to corrosion
B) They are prone to physical damage
, C) They do not allow proper airflow
D) They are more difficult to install than rigid pipe
Answer: B) They are prone to physical damage
Rationale: Long flexible gas connectors can be susceptible to physical damage,
which could lead to gas leaks or unsafe operation. Keep the connector as short as
possible.
9. What is the primary function of a furnace venting system?
A) To prevent the furnace from overheating
B) To allow hot air to circulate through the home
C) To safely expel combustion gases from the furnace to the outside
D) To return cooled air to the furnace for reheating
Answer: C) To safely expel combustion gases from the furnace to the outside
Rationale: The venting system ensures that the harmful gases produced during
combustion are safely expelled, protecting the indoor air quality.
10. What must be done after installing a gas furnace to ensure it is operating
efficiently?
A) Check the furnace’s ignition system and burner operation
B) Turn off the furnace and restart it after 30 minutes
C) Adjust the fuel mixture to the furnace’s default setting
D) Disconnect the thermostat and test the furnace manually
Answer: A) Check the furnace’s ignition system and burner operation
Rationale: Ensuring that the ignition system and burners are operating properly is
essential for safe and efficient operation. This should always be checked after
installation.
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