HVAC GAS HEAT CERTIFICATION EXAM LATEST 2024-2025 WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS ALREADY GRADED A+ 100%
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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
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