NATE GAS HEATING EXAM QUESTIONS WITH COMPLETE SOLUTIONS

NATE GAS HEATING EXAM QUESTIONS WITH COMPLETE SOLUTIONS




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%



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



A: 85%



B: 90%



C: 100%

,NATE GAS HEATING EXAM QUESTIONS WITH COMPLETE SOLUTIONS




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:



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

, NATE GAS HEATING EXAM QUESTIONS WITH COMPLETE SOLUTIONS




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.



A: 11"



B: 10"



C: 3.5"



D: 2" - (ANSWER)C: 3.5"



Burning one cubic foot of natural gas releases approximately _____ btu.



A: 800



B: 1,050



C: 12,000



D: 15,000 - (ANSWER)B: 1,050