HVAC GAS HEAT CERTIFICATION EXAM 2025
QUESTIONS WITH COMPLETE SOLUTIONS!!
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
Answer - 18 inches
A good description of how a bi-metal fan switch operates the blower motor on
a gas furnace is Answer - Temperature on- temperature off
Redundant gas valves used on gas furnaces have Answer - Dual gas shut off
seats
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs Answer - 2000 - 2500
LP gas has a specific gravity of Answer - 1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? Answer - Mix primary air and gas
Furnace limit switches are wired in series with the 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 Answer - 3 feet
, A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should Answer - Inform the homeowner and turn
the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners Answer - 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National
Field Gas Code. Answer - Category IV
Type B vent pipe must be kept at least _____ from combustible materials
Answer - One inch
Typical condensing furnaces have an AFUE rating of at least Answer - 90%
You have installed a Category IV two-pipe vent system that terminates through
the roof of the residence. The elbow for the combustion air intake, above the
roof, should Answer - Point it down
The reason heating thermostat have anticipated is to Answer - Reduce lag
The typical flue gas temperature of a Category III furnace is Answer - 280°F -
300°F
Natural gas primary consists of Answer - Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's
Answer - 900~1,100
QUESTIONS WITH COMPLETE SOLUTIONS!!
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
Answer - 18 inches
A good description of how a bi-metal fan switch operates the blower motor on
a gas furnace is Answer - Temperature on- temperature off
Redundant gas valves used on gas furnaces have Answer - Dual gas shut off
seats
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs Answer - 2000 - 2500
LP gas has a specific gravity of Answer - 1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? Answer - Mix primary air and gas
Furnace limit switches are wired in series with the 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 Answer - 3 feet
, A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should Answer - Inform the homeowner and turn
the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners Answer - 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National
Field Gas Code. Answer - Category IV
Type B vent pipe must be kept at least _____ from combustible materials
Answer - One inch
Typical condensing furnaces have an AFUE rating of at least Answer - 90%
You have installed a Category IV two-pipe vent system that terminates through
the roof of the residence. The elbow for the combustion air intake, above the
roof, should Answer - Point it down
The reason heating thermostat have anticipated is to Answer - Reduce lag
The typical flue gas temperature of a Category III furnace is Answer - 280°F -
300°F
Natural gas primary consists of Answer - Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's
Answer - 900~1,100
