HVAC Gas Heat Certification Exam Latest 2026
Questions and Correct Detailed Answers Already
Graded A+
Which conditions listed below would cause the temperature limit safety switch to
shut off the burner - CORRECT ANSWER-Fan motor failure
The cut off plate is a component of the - CORRECT ANSWER-Blower housing
A "spud" or burner orifice - CORRECT ANSWER-Meters gas to the burner
A good thermocouple should read approximately ____ on a D.C. meter -
CORRECT ANSWER-30 millivolta
Liquefied petroleum, (LP) gases are - CORRECT ANSWER-Propane and butane
Fan time/temperature delay switches are used on gas furnaces to - CORRECT
ANSWER-Allow the heat exchanger to warm up
,A gas furnace is to be installed in a garage. The national standards require that
the burners and ignition sources must be located ______ above the floor -
CORRECT ANSWER-18 inches
A good description of how a bi-metal fan switch operates the blower motor on a
gas furnace is - CORRECT ANSWER-Temperature on- temperature off
Redundant gas valves used on gas furnaces have - CORRECT ANSWER-Dual gas
shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs - CORRECT ANSWER-2000 - 2500
LP gas has a specific gravity of - CORRECT ANSWER-1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? - CORRECT ANSWER-Mix primary air and gas
Furnace limit switches are wired in series with the - CORRECT ANSWER-Gas
valve
, A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend _____ beyond the support point - CORRECT ANSWER-3
feet
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should - CORRECT ANSWER-Inform the homeowner
and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners - CORRECT ANSWER-3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National
Field Gas Code. - CORRECT ANSWER-Category IV
Type B vent pipe must be kept at least _____ from combustible materials -
CORRECT ANSWER-One inch
Typical condensing furnaces have an AFUE rating of at least - CORRECT
ANSWER-90%
Questions and Correct Detailed Answers Already
Graded A+
Which conditions listed below would cause the temperature limit safety switch to
shut off the burner - CORRECT ANSWER-Fan motor failure
The cut off plate is a component of the - CORRECT ANSWER-Blower housing
A "spud" or burner orifice - CORRECT ANSWER-Meters gas to the burner
A good thermocouple should read approximately ____ on a D.C. meter -
CORRECT ANSWER-30 millivolta
Liquefied petroleum, (LP) gases are - CORRECT ANSWER-Propane and butane
Fan time/temperature delay switches are used on gas furnaces to - CORRECT
ANSWER-Allow the heat exchanger to warm up
,A gas furnace is to be installed in a garage. The national standards require that
the burners and ignition sources must be located ______ above the floor -
CORRECT ANSWER-18 inches
A good description of how a bi-metal fan switch operates the blower motor on a
gas furnace is - CORRECT ANSWER-Temperature on- temperature off
Redundant gas valves used on gas furnaces have - CORRECT ANSWER-Dual gas
shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs - CORRECT ANSWER-2000 - 2500
LP gas has a specific gravity of - CORRECT ANSWER-1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? - CORRECT ANSWER-Mix primary air and gas
Furnace limit switches are wired in series with the - CORRECT ANSWER-Gas
valve
, A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend _____ beyond the support point - CORRECT ANSWER-3
feet
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should - CORRECT ANSWER-Inform the homeowner
and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners - CORRECT ANSWER-3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National
Field Gas Code. - CORRECT ANSWER-Category IV
Type B vent pipe must be kept at least _____ from combustible materials -
CORRECT ANSWER-One inch
Typical condensing furnaces have an AFUE rating of at least - CORRECT
ANSWER-90%
