NATE GAS HEATING EXAM MASTER REVIEW
SET 2026
◉ The gas control valve may be damaged if exposed to an inlet
pressure above... Answer: 14 inWC
◉ How many elbows and joints should a vent connector have...
Answer: As few as possible to reduce resistance of flue gases
◉ The technician is installing a vent system for a condensing gas
furnace. The furnace is several feet from a gas water heater. What
conditions, if any, may the technician route the exhaust of the
furnace into the exhaust vent of the water heater... 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... 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... Answer: Supported with a minimum strap width of 1/2"
,◉ A technician is installing a gas furnace and the customer has
decided not to install an air conditioner. Making this decision, the
effect it will have on the installation of the supply ductwork is...
Answer: Adequate space should be allowed for addition of a coil in
the future when feasible
◉ Leveling of a mercury bulb is... Answer: Critical
◉ Spray-type atomizing humidifiers are installed to... Answer:
Discharge moisture into the supply duct
◉ Electronic air cleaners(EAC) installed in a gas furnace system
should be wired so they... Answer: Only operate any time the EAC
On-Off switch is turned to ON
◉ The LP gas manifold pressure is commonly... Answer: 10-11 inWC
◉ The polarity of a 120V gas furnace equipped with electronic flame
rectification is important because... Answer: The ignition control
may not prove flame
◉ Using a voltmeter, a technician can determine voltage drop at a
gas furnace... 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... 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... 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... Answer: Hard and forceful flame with a light blue
appearance and little or no yellow
◉ Compressed air is recommended for a... Answer: Pressurization
leak test of fuel gas pipe
◉ Diaphragm type differential pressure gauge is used to... Answer:
Measure air pressure
◉ The pressure reading on a manometer is expressed in... Answer:
Inches of Water Column
◉ A technician measures the return air temperature of a 100,000
BTU output gas furnace to be 65F and the supply side air
temperature is 135F... Answer: The CFM would be 1323
SET 2026
◉ The gas control valve may be damaged if exposed to an inlet
pressure above... Answer: 14 inWC
◉ How many elbows and joints should a vent connector have...
Answer: As few as possible to reduce resistance of flue gases
◉ The technician is installing a vent system for a condensing gas
furnace. The furnace is several feet from a gas water heater. What
conditions, if any, may the technician route the exhaust of the
furnace into the exhaust vent of the water heater... 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... 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... Answer: Supported with a minimum strap width of 1/2"
,◉ A technician is installing a gas furnace and the customer has
decided not to install an air conditioner. Making this decision, the
effect it will have on the installation of the supply ductwork is...
Answer: Adequate space should be allowed for addition of a coil in
the future when feasible
◉ Leveling of a mercury bulb is... Answer: Critical
◉ Spray-type atomizing humidifiers are installed to... Answer:
Discharge moisture into the supply duct
◉ Electronic air cleaners(EAC) installed in a gas furnace system
should be wired so they... Answer: Only operate any time the EAC
On-Off switch is turned to ON
◉ The LP gas manifold pressure is commonly... Answer: 10-11 inWC
◉ The polarity of a 120V gas furnace equipped with electronic flame
rectification is important because... Answer: The ignition control
may not prove flame
◉ Using a voltmeter, a technician can determine voltage drop at a
gas furnace... 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... 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... 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... Answer: Hard and forceful flame with a light blue
appearance and little or no yellow
◉ Compressed air is recommended for a... Answer: Pressurization
leak test of fuel gas pipe
◉ Diaphragm type differential pressure gauge is used to... Answer:
Measure air pressure
◉ The pressure reading on a manometer is expressed in... Answer:
Inches of Water Column
◉ A technician measures the return air temperature of a 100,000
BTU output gas furnace to be 65F and the supply side air
temperature is 135F... Answer: The CFM would be 1323
