NATE GAS HEATING EXAM ACTUAL EXAM 2026 | ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED ANSWERS | UPDATED VERSION

NATE GAS HEATING EXAM ACTUAL EXAM 2026
| ALL QUESTIONS AND CORRECT ANSWERS |
VERIFIED ANSWERS | UPDATED VERSION

Heat transfers from an object or area at a higher temperature to an
object or area at a lower temperature. A heated heat exchanger
transfers heat to the air by:


A: Conduction


B: Natural convection


C: Radiation


D: Forced convection ---------CORRECT ANSWER-----------------D: Forced
convection




The voltage that creates a spark on a spark ignition system is
approximately:


A: 240 volts

,B: 5,000 volts


C: 15,000 volts


D: 25,000 volts ---------CORRECT ANSWER-----------------C: 15,000 volts




The capacity of a natural gas furnace is de-rated by _______ for every
1000 feet above sea level:


A: 1%


B: 2%


C: 3%


D: 4% ---------CORRECT ANSWER-----------------D: 4%




A crack in a heat exchanger can:


A: Allow combustion gases to mix with the space air

,B: Prevent the heat from effectively transferring to the air


C: Cause the high-limit control to shut the furnace down


D: Cause the furnace to catch on fire ---------CORRECT ANSWER-----------
------A: Allow combustion gases to mix with the space air




Gas valves operate on what voltage?


A: 12 volts


B: 24 volts


C: 120 volts


D: 230 volts ---------CORRECT ANSWER-----------------B: 24 volts




Mid-efficiency furnaces operate with flue gas temperatures between:

, A: 275 and 360 degrees


B: 200 and 500 degrees


C: 100 and 275 degrees


D: 80 and 100 degrees ---------CORRECT ANSWER-----------------A: 275
and 360 degrees




High-efficiency furnaces operate with flue gas temperatures between:


A: 275 and 360 degrees


B: 200 and 500 degrees


C: 100 and 275 degrees


D: 80 and 100 degrees ---------CORRECT ANSWER-----------------C: 100
and 275 degrees




"B" vent is: