NATE GAS HEATING (ACTUAL 2025/2026) EXAM QUESTIONS AND VERIFIED 100% ANSWERS

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NATE GAS HEATING (ACTUAL 2025/2026) EXAM
QUESTIONS AND VERIFIED 100% ANSWERS
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% - (answer)C: 78%



Many pre-1992 furnaces have efficiencies around _______.



A: 10%



B: 40%



C: 60%



D: 80% - (answer)C: 60%

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Today, furnaces with AFUE ratings greater than _____ are available.



A: 85%



B: 90%



C: 100%



D: 110% - (answer)B: 90%



A thermocouple is used with:



A: Intermittent pilot systems



B: Direct spark ignition systems



C: Glow coil ignition systems



D: Standing pilot ignition systems - (answer)D: Standing pilot ignition systems



The purpose of the gas pressure regulator is to:

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A: Keep the color of the flame constant



B: Keep the high limit switch from tripping



C: Maintain a constant gas pressure at the burner



D: Allow the gas valve to operate smoothly and accurately - (answer)C: Maintain
a constant gas pressure at the burner



The instrument used to measure outlet gas pressure is the:



A: Velometer



B: Anemometer



C: Monometer



D: Draft gauge - (answer)C: Monometer



The regulator on a natural gas furnace should be adjusted to supply _____ inches
of pressure at the burners.