NATE GAS FURNACES PREP |ACTUAL QUESTIONS
AND VERIFIED ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
In a modern gas furnace, the component that seperates the combustion gases from the
supply air is the ______.
A) gas valve
B) heat exchanger
C) inducer fan
D) plenum box
CORRECT ANSWER
B) heat exchanger
Question 2
What type of furnace moves warm air through the conditioned space without a fan?
A) Gravity
B) Horizontal
C) Lowboy
D) Upflow
CORRECT ANSWER
A) Gravity
Question 3
Furnace heat exchangers generally are made of ______.
1
,A) ceramic
B) copper
C) plastic
D) steel
CORRECT ANSWER
D) steel
Question 4
What does AFUE stand for?
A) Actual Fuel Usage Efficiency
B) Annual Fuel Utilization Efficiency
C) Annual Furnace Usage Equivalency
D) Approved Fuel Usage Estimate
CORRECT ANSWER
B) Annual Fuel Utilization Efficiency
Question 5
The main purpose of a secondary heat exchanger is to ______.
A) evaporate the flue gases
B) provide a backup containment
C) remove additional heat from the flue gases
D) reverse the primary air flow
CORRECT ANSWER
C) remove additional heat from the flue gases
2
,Question 6
Which gas commonly used as a fuel in gas furnaces is heavier than air?
A) Butane
B) Isobutane
C) Methane
D) Propane
CORRECT ANSWER
D) Propane
Question 7
Which grade of fuel oil is most commonly used in residential furnaces?
A) 1
B) 2
C) 3
D) 4
CORRECT ANSWER
B) 2
Question 8
How many cubic feet of air are needed to burn 1 ft^3 of natural gas?
A) 6 ft^3
B) 10 ft^3
C) 18 ft^3
D) 24 ft^3
3
, CORRECT ANSWER
B) 10 ft^3
Question 9
How many cubic feet of air are needed to burn 1 ft^3 of propane?
A) 6 ft^3
B) 10 ft^3
C) 18 ft^^3
D) 24 ft^3
CORRECT ANSWER
D) 24 ft^3
Question 10
What is the approximate heat content of 1 ft^3 of natural gas?
A) 500 Btu
B) 800 Btu
C) 1,050 Btu
D) 2,500 Btu
CORRECT ANSWER
C) 1,050 Btu
Question 11
What is the approximate heat content of 1 ft^3 of propane?
A) 500 Btu
4
AND VERIFIED ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
In a modern gas furnace, the component that seperates the combustion gases from the
supply air is the ______.
A) gas valve
B) heat exchanger
C) inducer fan
D) plenum box
CORRECT ANSWER
B) heat exchanger
Question 2
What type of furnace moves warm air through the conditioned space without a fan?
A) Gravity
B) Horizontal
C) Lowboy
D) Upflow
CORRECT ANSWER
A) Gravity
Question 3
Furnace heat exchangers generally are made of ______.
1
,A) ceramic
B) copper
C) plastic
D) steel
CORRECT ANSWER
D) steel
Question 4
What does AFUE stand for?
A) Actual Fuel Usage Efficiency
B) Annual Fuel Utilization Efficiency
C) Annual Furnace Usage Equivalency
D) Approved Fuel Usage Estimate
CORRECT ANSWER
B) Annual Fuel Utilization Efficiency
Question 5
The main purpose of a secondary heat exchanger is to ______.
A) evaporate the flue gases
B) provide a backup containment
C) remove additional heat from the flue gases
D) reverse the primary air flow
CORRECT ANSWER
C) remove additional heat from the flue gases
2
,Question 6
Which gas commonly used as a fuel in gas furnaces is heavier than air?
A) Butane
B) Isobutane
C) Methane
D) Propane
CORRECT ANSWER
D) Propane
Question 7
Which grade of fuel oil is most commonly used in residential furnaces?
A) 1
B) 2
C) 3
D) 4
CORRECT ANSWER
B) 2
Question 8
How many cubic feet of air are needed to burn 1 ft^3 of natural gas?
A) 6 ft^3
B) 10 ft^3
C) 18 ft^3
D) 24 ft^3
3
, CORRECT ANSWER
B) 10 ft^3
Question 9
How many cubic feet of air are needed to burn 1 ft^3 of propane?
A) 6 ft^3
B) 10 ft^3
C) 18 ft^^3
D) 24 ft^3
CORRECT ANSWER
D) 24 ft^3
Question 10
What is the approximate heat content of 1 ft^3 of natural gas?
A) 500 Btu
B) 800 Btu
C) 1,050 Btu
D) 2,500 Btu
CORRECT ANSWER
C) 1,050 Btu
Question 11
What is the approximate heat content of 1 ft^3 of propane?
A) 500 Btu
4
