NATE - Gas & Heat Exam Questions With
Correct Answers
What precautions are required when mounting any gas furnace on a
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wood platform in an attic? - CORRECT ANSWER✔✔-None
| | | | | | |
The gas control valve may be damaged if exposed to an inlet pressure
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above: - CORRECT ANSWER✔✔-14 in. W.C.
| | | | |
How many elbows and joints should a vent connector have: - CORRECT
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ANSWER✔✔-As few as possible to reduce resistance of flue gases | | | | | | | | |
What conditions, if any may a technician route the exhaust of the
| | | | | | | | | | | |
furnace into the exhaust vent of the water heater? - CORRECT
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ANSWER✔✔-Under no conditions may you use the water heater | | | | | | | | |
exhaust vent. |
How may a technician terminate the intake and exhaust for proper
| | | | | | | | | | |
operation of a high efficiency gas furnace when using scheduled 40 PVC
| | | | | | | | | | | |
pipe: - CORRECT ANSWER✔✔-By using the specific manufacturers
| | | | | | | |
termination kit or make one to meet their requirements.
| | | | | | | |
,When suspended with metal strap and no saddle, flexible duct should
| | | | | | | | | | |
be: - CORRECT ANSWER✔✔-Supported with a minimum strap width of
| | | | | | | | | |
1/2"
Installing a gas furnace and not an air conditioner has what affect on the
| | | | | | | | | | | | |
|installation of the supply ductwork: - CORRECT ANSWER✔✔-Leave | | | | | | | |
adequate space should be allowed for addition of a coil in the future
| | | | | | | | | | | | |
when feasible |
Leveling of a Mercury bulb is: - CORRECT ANSWER✔✔-Critical
| | | | | | | |
Spray-type atomizing humidifiers are installed to: - CORRECT
| | | | | | | |
ANSWER✔✔-Discharge moisture into the supply duct | | | | |
Electronic air cleaners (EAC) installed in a gas furnace system should be
| | | | | | | | | | | |
wired so they: - CORRECT ANSWER✔✔-Only operate any time the EAC
| | | | | | | | | | |
On-Off switch is turned to ON. | | | | |
The LP gas manifold pressure is commonly: - CORRECT ANSWER✔✔-10
| | | | | | | | | |
to 11 in. W.C.
| | |
The polarity of a 120V gas furnace equipped with electronic flame
| | | | | | | | | | |
rectification is important because: - CORRECT ANSWER✔✔-The ignition | | | | | | | |
control may not prove flame | | | |
, Using a voltmeter, a technician can determine voltage drop at a gas
| | | | | | | | | | | |
furnace: - CORRECT ANSWER✔✔-With the furnace not operating and
| | | | | | | | |
then with the furnace operating.
| | | |
The setting on a 4 speed PSC blower motor can be changed by changing
| | | | | | | | | | | | | |
the: - CORRECT ANSWER✔✔-Motor tap connection
| | | | |
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 | |
Correct Answers
What precautions are required when mounting any gas furnace on a
| | | | | | | | | | |
wood platform in an attic? - CORRECT ANSWER✔✔-None
| | | | | | |
The gas control valve may be damaged if exposed to an inlet pressure
| | | | | | | | | | | | |
above: - CORRECT ANSWER✔✔-14 in. W.C.
| | | | |
How many elbows and joints should a vent connector have: - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-As few as possible to reduce resistance of flue gases | | | | | | | | |
What conditions, if any may a technician route the exhaust of the
| | | | | | | | | | | |
furnace into the exhaust vent of the water heater? - CORRECT
| | | | | | | | | | |
ANSWER✔✔-Under no conditions may you use the water heater | | | | | | | | |
exhaust vent. |
How may a technician terminate the intake and exhaust for proper
| | | | | | | | | | |
operation of a high efficiency gas furnace when using scheduled 40 PVC
| | | | | | | | | | | |
pipe: - CORRECT ANSWER✔✔-By using the specific manufacturers
| | | | | | | |
termination kit or make one to meet their requirements.
| | | | | | | |
,When suspended with metal strap and no saddle, flexible duct should
| | | | | | | | | | |
be: - CORRECT ANSWER✔✔-Supported with a minimum strap width of
| | | | | | | | | |
1/2"
Installing a gas furnace and not an air conditioner has what affect on the
| | | | | | | | | | | | |
|installation of the supply ductwork: - CORRECT ANSWER✔✔-Leave | | | | | | | |
adequate space should be allowed for addition of a coil in the future
| | | | | | | | | | | | |
when feasible |
Leveling of a Mercury bulb is: - CORRECT ANSWER✔✔-Critical
| | | | | | | |
Spray-type atomizing humidifiers are installed to: - CORRECT
| | | | | | | |
ANSWER✔✔-Discharge moisture into the supply duct | | | | |
Electronic air cleaners (EAC) installed in a gas furnace system should be
| | | | | | | | | | | |
wired so they: - CORRECT ANSWER✔✔-Only operate any time the EAC
| | | | | | | | | | |
On-Off switch is turned to ON. | | | | |
The LP gas manifold pressure is commonly: - CORRECT ANSWER✔✔-10
| | | | | | | | | |
to 11 in. W.C.
| | |
The polarity of a 120V gas furnace equipped with electronic flame
| | | | | | | | | | |
rectification is important because: - CORRECT ANSWER✔✔-The ignition | | | | | | | |
control may not prove flame | | | |
, Using a voltmeter, a technician can determine voltage drop at a gas
| | | | | | | | | | | |
furnace: - CORRECT ANSWER✔✔-With the furnace not operating and
| | | | | | | | |
then with the furnace operating.
| | | |
The setting on a 4 speed PSC blower motor can be changed by changing
| | | | | | | | | | | | | |
the: - CORRECT ANSWER✔✔-Motor tap connection
| | | | |
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 | |
