NATE - GAS EXAM QUESTIONS WITH COMPLETE SOLUTIONS
GUARANTEED PASS (2025/2026)
When starting up a dual system, the temperature rise method for
determining airflow cannot be used with compressor cycle of the
heat pump because: - CORRECT ANSWER >>The capacity of the
system varies too much with outdoor temperature.
The flame pattern a technician would expect to see on a properly
operating single stage gas furnace equipped with "in shot" type
burner is a: - CORRECT ANSWER >>Hard and forceful flame
with a light blue appearance and little to no yellow
,Compressed air is recommended for a: - CORRECT ANSWER
>>Pressurization leak test of fuel gas pipe
Diaphragm type differential pressure gauge is used to: -
CORRECT ANSWER >>Measure air pressure
The pressure reading on a manometer is expressed in: -
CORRECT ANSWER >>Inches of water
A technician measures the return air temperature of a 100,000
BTU output gas furnace to be 65 degrees and the supply side air
temperature is 135 degrees: - CORRECT ANSWER >>The CFM
would be 1323
A dirty or clogged air filter in an operating gas furnace can cause
an: - CORRECT ANSWER >>Increase temperature rise
Bent vanes on a direct drive blower wheel in a gas furnace can
cause a: - CORRECT ANSWER >>Loss in airflow, excessive
blower motor wear, and increase noise
, A gas clothes dryer can interfere with the operation of a nearby
natural draft gas furnace with an atmospheric burner by: -
CORRECT ANSWER >>Stealing combustion air preventing
complete fuel burning
During a preventive maintenance check of a gas furnace: -
CORRECT ANSWER >>Ductwork should always be checked for
leaks and damage
When performing a cycle check during a preventive maintenance
call, the technician should: - CORRECT ANSWER >>First, check
with owner for equipment performance
Next, turn the unit off at the thermostat system switch
Next, set fan switch to ON and check that the blower is running
The measurements required to calculate the CFM of a gas
furnace are: - CORRECT ANSWER >>Entering air temperature
Leaving air temperature
Outdoor ambient and rated capacity
The reason for checking the temperature rise across the heat
exchanger of a gas furnace is to: - CORRECT ANSWER
>>Compare temperature differential to nameplate rating
GUARANTEED PASS (2025/2026)
When starting up a dual system, the temperature rise method for
determining airflow cannot be used with compressor cycle of the
heat pump because: - CORRECT ANSWER >>The capacity of the
system varies too much with outdoor temperature.
The flame pattern a technician would expect to see on a properly
operating single stage gas furnace equipped with "in shot" type
burner is a: - CORRECT ANSWER >>Hard and forceful flame
with a light blue appearance and little to no yellow
,Compressed air is recommended for a: - CORRECT ANSWER
>>Pressurization leak test of fuel gas pipe
Diaphragm type differential pressure gauge is used to: -
CORRECT ANSWER >>Measure air pressure
The pressure reading on a manometer is expressed in: -
CORRECT ANSWER >>Inches of water
A technician measures the return air temperature of a 100,000
BTU output gas furnace to be 65 degrees and the supply side air
temperature is 135 degrees: - CORRECT ANSWER >>The CFM
would be 1323
A dirty or clogged air filter in an operating gas furnace can cause
an: - CORRECT ANSWER >>Increase temperature rise
Bent vanes on a direct drive blower wheel in a gas furnace can
cause a: - CORRECT ANSWER >>Loss in airflow, excessive
blower motor wear, and increase noise
, A gas clothes dryer can interfere with the operation of a nearby
natural draft gas furnace with an atmospheric burner by: -
CORRECT ANSWER >>Stealing combustion air preventing
complete fuel burning
During a preventive maintenance check of a gas furnace: -
CORRECT ANSWER >>Ductwork should always be checked for
leaks and damage
When performing a cycle check during a preventive maintenance
call, the technician should: - CORRECT ANSWER >>First, check
with owner for equipment performance
Next, turn the unit off at the thermostat system switch
Next, set fan switch to ON and check that the blower is running
The measurements required to calculate the CFM of a gas
furnace are: - CORRECT ANSWER >>Entering air temperature
Leaving air temperature
Outdoor ambient and rated capacity
The reason for checking the temperature rise across the heat
exchanger of a gas furnace is to: - CORRECT ANSWER
>>Compare temperature differential to nameplate rating
