HVAC GAS HEAT CERTIFICATION EXAM UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

HVAC GAS HEAT CERTIFICATION EXAM UPDATED
ACTUAL QUESTIONS AND CORRECT ANSWERS

Question:
1. 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

Question:
2. A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is
Answer:
Temperature on- temperature off

Question:
3. Redundant gas valves used on gas furnaces have
Answer:
Dual gas shut off seats

Question:
4. Burning one cubic foot of liquefied petroleum gas completely will produce approximately ______ BTUs
Answer:
2000 - 2500

Question:
5. LP gas has a specific gravity of
Answer:
1.5 - 2.0

Question:
6. What is the purpose of a spoiler screw located on a burner, or adjustable-shutters?
Answer:
Mix primary air and gas

Question:
7. Furnace limit switches are wired in series with the
Answer:
Gas valve

Question:
8. 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

, Question:
9. 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

Question:
10. A natural gas furnace usually requires _____ gas pressure at the manifold and burners
Answer:
3.5 in. W.C.

Question:
11. The vent system for a condensing furnace is classified as ____ by the National Field Gas Code.
Answer:
Category IV

Question:
12. Type B vent pipe must be kept at least _____ from combustible materials
Answer:
One inch

Question:
13. Typical condensing furnaces have an AFUE rating of at least
Answer:
90%

Question:
14. 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

Question:
15. The reason heating thermostat have anticipated is to
Answer:
Reduce lag

Question:
16. The typical flue gas temperature of a Category III furnace is
Answer:
280°F - 300°F

Question:
17. Natural gas primary consists of
Answer:
Methane