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NATE GAS & HEAT Questions and
Correct Answers Latest Update Already
Graded A+
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:-
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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
There are two generally used methods for controlling temperature and humidity
within individual zones of a residence:-correct-answer-One is to use dampers to
control supply airflow to each zone. The other is to use separate and independent
systems to condition the air in each zone.
A packaged unit in a two story installation is to be located at ground level with
ductwork running up the outside wall to a chase in the second floor.-correct-
answer-The precautions need to be taken with outside ductwork is it must be
insulated and weatherproofed.
The maximum flue gas temperature for condensing furnaces utilizing schedule 40
PVC pipe is:-correct-answer-140 degrees
The maximum recommended face velocity for a residential non-filter return grille
is:-correct-answer-800 fpm
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According to mechanical codes, the unobstructed working space should be
provided alone the entire front (or firebox side) of a warm-air gas furnace installed
in an attic is:-correct-answer-Not less than 30" in depth and Not less than 30" in
height
The initials "AFUE" represent:-correct-answer-Annual Fuel Utilization Efficiency
The INPUTS to a typical integrated control board in a high efficiency furnace are
the:-correct-answer-Thermostat voltage from W
Flame proving signal
Pressure switch voltage
On a 20 amp (FLA) motor the minimum circuit a ampacity (MCA) should be:-
correct-answer-25 amps
Differential pressure gauge (also called a manometer) is used to:-correct-answer-
Measure duct static pressure
A line voltage fuse is sized to protect from:-correct-answer-Excessive voltage
NATE GAS & HEAT Questions and
Correct Answers Latest Update Already
Graded A+
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:-
,2|Page
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
There are two generally used methods for controlling temperature and humidity
within individual zones of a residence:-correct-answer-One is to use dampers to
control supply airflow to each zone. The other is to use separate and independent
systems to condition the air in each zone.
A packaged unit in a two story installation is to be located at ground level with
ductwork running up the outside wall to a chase in the second floor.-correct-
answer-The precautions need to be taken with outside ductwork is it must be
insulated and weatherproofed.
The maximum flue gas temperature for condensing furnaces utilizing schedule 40
PVC pipe is:-correct-answer-140 degrees
The maximum recommended face velocity for a residential non-filter return grille
is:-correct-answer-800 fpm
, 3|Page
According to mechanical codes, the unobstructed working space should be
provided alone the entire front (or firebox side) of a warm-air gas furnace installed
in an attic is:-correct-answer-Not less than 30" in depth and Not less than 30" in
height
The initials "AFUE" represent:-correct-answer-Annual Fuel Utilization Efficiency
The INPUTS to a typical integrated control board in a high efficiency furnace are
the:-correct-answer-Thermostat voltage from W
Flame proving signal
Pressure switch voltage
On a 20 amp (FLA) motor the minimum circuit a ampacity (MCA) should be:-
correct-answer-25 amps
Differential pressure gauge (also called a manometer) is used to:-correct-answer-
Measure duct static pressure
A line voltage fuse is sized to protect from:-correct-answer-Excessive voltage
