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NATE GAS HEATING EXA M
QUESTIONS WITH CORRE CT
ANSWERS
Question :Since 1992, the United States Department of
Energy has required that all furnaces sold and installed from
that date on must have an AFUE of no less than:
A: 70%
B: 75%
C: 78%
D: 80%
Correct answer: C: 78%
Question :Many pre-1992 furnaces have efficiencies around
_______.
A: 10%
B: 40%
C: 60%
D: 80%
Correct answer: C: 60%
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Question :Today, furnaces with AFUE ratings greater than
_____ are available.
A: 85%
B: 90%
C: 100%
D: 110%
Correct answer: B: 90%
Question :A thermocouple is used with:
A: Intermittent pilot systems
B: Direct spark ignition systems
C: Glow coil ignition systems
D: Standing pilot ignition systems
Correct answer: D: Standing pilot ignition systems
Question :The purpose of the gas pressure regulator is to:
A: Keep the color of the flame constant
B: Keep the high limit switch from tripping
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C: Maintain a constant gas pressure at the burner
D: Allow the gas valve to operate smoothly and accurately
Correct answer: C: Maintain a constant gas pressure at the burner
Question :The instrument used to measure outlet gas pressure
is the:
A: Velometer
B: Anemometer
C: Monometer
D: Draft gauge
Correct answer: C: Monometer
Question :The regulator on a natural gas furnace should be
adjusted to supply _____ inches of pressure at the burners.
A: 11"
B: 10"
C: 3.5"
D: 2"
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Correct answer: C: 3.5"
Question :Burning one cubic foot of natural gas releases
approximately _____ btu.
A: 800
B: 1,050
C: 12,000
D: 15,000
Correct answer: B: 1,050
Question :Under ideal conditions natural gas has an ignition
temperature of _______ degrees F and a burning temperature of ________ degrees F.
A: 800 degrees, 1000 degrees
B: 1,100 degrees, 3,500 degrees
C: 1,100 degrees, 5,000 degrees
D: 2,500 degrees, 8,000 degrees
Correct answer: B: 1,100 degrees, 3,500 degrees
