NATE GAS & HEAT EXAM PRACTICE QUESTIONS
WITH VERIFIED SOLUTIONS NEW MODIFIED
TESTED AND GRADED A+ NEW UPDATE
Which grade of fuel oil is most commonly used in residential furnaces?
a. 1
b. 2
c. 3
d. 4 --CORRECT ANSWER--b (2)
How many cubic feet of air are needed to burn 1 ft3 of natural gas?
a. 6 ft.3
b. 10 ft.3
c. 18 ft.3
d. 24 ft.3 --CORRECT ANSWER--b (10 ft.3)
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)
What is the average 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)
Page 1 of 75
,What is the average heat content of 1 ft.3 of propane?
a. 500 Btu
b. 800 Btu
c. 1,050 Btu
d. 2,500 Btu --CORRECT ANSWER--d (2,500 Btu)
What is the average heat content of one gallon of No. 2 fuel oil?
a. 80,000 Btu
b. 110,000 Btu
c. 140,000 Btu
d. 170,000 Btu --CORRECT ANSWER--c (140,000 Btu)
In a modern gas furnace, the component that separates 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)
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)
Furnace heat exchangers generally are made of ______.
a. ceramic
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,b. copper
c. plastic
d. steel --CORRECT ANSWER--d (steel)
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)
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)
Which gas commonly used as a fuel in gas furnaces is heavier than air?
a. butane
b. isobutene
c. methane
d. propane --CORRECT ANSWER--d (propane)
What is a typical manifold pressure for a natural gas furnace?
a. 3.5 in. w.g.
b. 11 in. w.g.
c. 2 psi
d. 5 psi --CORRECT ANSWER--a (3.5 in. w.g.)
Page 3 of 75
, What is a typical manifold pressure for a propane furnace?
a. 3.5 in. w.g.
b. 11 in. w.g.
c. 2 psi
d. 5 psi --CORRECT ANSWER--b (11 in. w.g.)
What type of furnace is commonly installed in a closet with underfloor supply
ducts?
a. Downflow
b. Horizontal
c. Lowboy
d. Upflow --CORRECT ANSWER--a (Downflow)
Which of the following is required for combustion?
a. Fuel
b. Heat
c. Oxygen
d. All of the above --CORRECT ANSWER--d (All of the above)
Which of the following is NOT a product of complete combustion?
a. Carbon dioxide
b. Carbon monoxide
c. Heat
d. Water --CORRECT ANSWER--b (Carbon monoxide)
An unconfined space (in terms of furnace installation) is defined as a space with
a volume equal to or greater than ______ per 1,000 Btu of input rating.
a. 25 ft.3
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WITH VERIFIED SOLUTIONS NEW MODIFIED
TESTED AND GRADED A+ NEW UPDATE
Which grade of fuel oil is most commonly used in residential furnaces?
a. 1
b. 2
c. 3
d. 4 --CORRECT ANSWER--b (2)
How many cubic feet of air are needed to burn 1 ft3 of natural gas?
a. 6 ft.3
b. 10 ft.3
c. 18 ft.3
d. 24 ft.3 --CORRECT ANSWER--b (10 ft.3)
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)
What is the average 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)
Page 1 of 75
,What is the average heat content of 1 ft.3 of propane?
a. 500 Btu
b. 800 Btu
c. 1,050 Btu
d. 2,500 Btu --CORRECT ANSWER--d (2,500 Btu)
What is the average heat content of one gallon of No. 2 fuel oil?
a. 80,000 Btu
b. 110,000 Btu
c. 140,000 Btu
d. 170,000 Btu --CORRECT ANSWER--c (140,000 Btu)
In a modern gas furnace, the component that separates 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)
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)
Furnace heat exchangers generally are made of ______.
a. ceramic
Page 2 of 75
,b. copper
c. plastic
d. steel --CORRECT ANSWER--d (steel)
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)
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)
Which gas commonly used as a fuel in gas furnaces is heavier than air?
a. butane
b. isobutene
c. methane
d. propane --CORRECT ANSWER--d (propane)
What is a typical manifold pressure for a natural gas furnace?
a. 3.5 in. w.g.
b. 11 in. w.g.
c. 2 psi
d. 5 psi --CORRECT ANSWER--a (3.5 in. w.g.)
Page 3 of 75
, What is a typical manifold pressure for a propane furnace?
a. 3.5 in. w.g.
b. 11 in. w.g.
c. 2 psi
d. 5 psi --CORRECT ANSWER--b (11 in. w.g.)
What type of furnace is commonly installed in a closet with underfloor supply
ducts?
a. Downflow
b. Horizontal
c. Lowboy
d. Upflow --CORRECT ANSWER--a (Downflow)
Which of the following is required for combustion?
a. Fuel
b. Heat
c. Oxygen
d. All of the above --CORRECT ANSWER--d (All of the above)
Which of the following is NOT a product of complete combustion?
a. Carbon dioxide
b. Carbon monoxide
c. Heat
d. Water --CORRECT ANSWER--b (Carbon monoxide)
An unconfined space (in terms of furnace installation) is defined as a space with
a volume equal to or greater than ______ per 1,000 Btu of input rating.
a. 25 ft.3
Page 4 of 75
