HVAC Gas Heat Certification Exam With
100% Correct Answers
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 answers ✔✔18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is -
correct answers ✔✔Temperature on- temperature off
Redundant gas valves used on gas furnaces have - correct answers ✔✔Dual gas shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce approximately
______ BTUs - correct answers ✔✔2000 - 2500
LP gas has a specific gravity of - correct answers ✔✔1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? - correct
answers ✔✔Mix primary air and gas
Furnace limit switches are wired in series with the - correct answers ✔✔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 answers ✔✔3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should - correct answers ✔✔Inform the homeowner and turn the gas off
, A natural gas furnace usually requires _____ gas pressure at the manifold and burners - correct
answers ✔✔3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Field Gas Code. -
correct answers ✔✔Category IV
Type B vent pipe must be kept at least _____ from combustible materials - correct answers
✔✔One inch
Typical condensing furnaces have an AFUE rating of at least - correct answers ✔✔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 - correct answers
✔✔Point it down
The reason heating thermostat have anticipated is to - correct answers ✔✔Reduce lag
The typical flue gas temperature of a Category III furnace is - correct answers ✔✔280°F - 300°F
Natural gas primary consists of - correct answers ✔✔Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's - correct answers
✔✔900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees. Temperature
measurements indicate a rise of 80 degrees. The most appropriate action is to - correct answers
✔✔Increase fan speed
100% Correct Answers
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 answers ✔✔18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is -
correct answers ✔✔Temperature on- temperature off
Redundant gas valves used on gas furnaces have - correct answers ✔✔Dual gas shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce approximately
______ BTUs - correct answers ✔✔2000 - 2500
LP gas has a specific gravity of - correct answers ✔✔1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? - correct
answers ✔✔Mix primary air and gas
Furnace limit switches are wired in series with the - correct answers ✔✔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 answers ✔✔3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should - correct answers ✔✔Inform the homeowner and turn the gas off
, A natural gas furnace usually requires _____ gas pressure at the manifold and burners - correct
answers ✔✔3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Field Gas Code. -
correct answers ✔✔Category IV
Type B vent pipe must be kept at least _____ from combustible materials - correct answers
✔✔One inch
Typical condensing furnaces have an AFUE rating of at least - correct answers ✔✔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 - correct answers
✔✔Point it down
The reason heating thermostat have anticipated is to - correct answers ✔✔Reduce lag
The typical flue gas temperature of a Category III furnace is - correct answers ✔✔280°F - 300°F
Natural gas primary consists of - correct answers ✔✔Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's - correct answers
✔✔900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees. Temperature
measurements indicate a rise of 80 degrees. The most appropriate action is to - correct answers
✔✔Increase fan speed
