NATE Gas & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide
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 & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide
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
B: Anemometer
, NATE Gas & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide
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
Under ideal conditions natural gas has an ignition temperature of _______ degrees F and a burning
temperature of ________ degrees F.
A: 800 degrees, 1000 degrees
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 & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide
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
B: Anemometer
, NATE Gas & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide
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
Under ideal conditions natural gas has an ignition temperature of _______ degrees F and a burning
temperature of ________ degrees F.
A: 800 degrees, 1000 degrees
