NATE Gas Heat Actual Exam
Secondary air is air that:
A: Is mixed with the fuel before the fuel reaches the burner
B: Is mixed with the fuel at the burner after the fuel has ignited
C: Remains unused after the combustion process is complete
D: Enters the draft diverter and goes up the stack with the products of combustion -
<<<<CORRECT ANSWERS>>>B: Is mixed with the fuel at the burner after the fuel has
ignited
The three major furnace configurations are:
A: Up-flow, down-flow and lowboy
B: Up-flow, down-flow and horizontal
C: Up-flow, down-flow and cross-flow
D: None of these is correct - <<<<CORRECT ANSWERS>>>B: Up-flow, down-flow and
horizontal
Residential gas furnaces use blowers powered by which types of motors?
A: Poly-phase, two phase, single phase and capacitor start
B: Shaded pole, split-phase, capacitor start and PSC
C: Three phase, shaded pole and PSC
D: Split-phase, induction start-induction run and variable speed DC - <<<<CORRECT
ANSWERS>>>D: Split-phase, induction start-induction run and variable speed DC
The horsepower range of residential heating blower motors is:
A: 1⁄8 to 1⁄16 hp
B: 1⁄4 to 1⁄2 hp
,C: 1⁄2 to 2 hp
D: 3⁄4 to 2 hp - <<<<CORRECT ANSWERS>>>B: 1⁄4 to 1⁄2 hp
A heat anticipator is wired:
A: In series with the "W" terminal
B: In parallel with the "W" terminal
C: In series with the "R" terminal
D: In parallel with the "R" terminal - <<<<CORRECT ANSWERS>>>A: In series with
the "W" terminal
Placing a jumper wire between the "R" terminal and the "G" terminal on a thermostat
subbase will energize the:
A: Gas valve
B: Indoor fan motor
C: Outdoor fan motor
D: Compressor - <<<<CORRECT ANSWERS>>>B: Indoor fan motor
Placing a jumper wire between the "R" terminal and the "W" terminal on a thermostat
sub-base will energize the:
A: Gas valve
B: Indoor fan motor
C: Outdoor fan motor
D: Compressor - <<<<CORRECT ANSWERS>>>A: Gas valve
Carbon monoxide is a:
A: Product of incomplete combustion
B: Poisonous gas
C: Odorless gas
, D: All of the above are correct - <<<<CORRECT ANSWERS>>>D: All of the above are
correct
The chemical symbol for carbon monoxide is:
A: CO2
B: CO
C: H2O
D: NH3 - <<<<CORRECT ANSWERS>>>B: CO
Selecting a lower speed tap setting on a furnace indoor blower motor will cause:
A: The temperature rise through the furnace to increase
B: The temperature rise through the furnace to decrease
C: The temperature rise through the furnace will not be affected
D: The furnace to act as a humidifier - <<<<CORRECT ANSWERS>>>A: The
temperature rise through the furnace to increase
"Carry over" channels or "cross overs" are used to:
A: Carry unused excess fuel back to the flue where it is sent up the stack
B: Carry primary air to the heat exchanger
C: Carry secondary air to the heat exchanger
D: Carry the flame from the first burner that lights to the remaining burners -
<<<<CORRECT ANSWERS>>>D: Carry the flame from the first burner that lights to the
remaining burners
Modern high-efficiency burners use combustion blowers. What are the two major types
of combustion blowers?
A: Induced draft and forced draft
B: High pressure and low pressure
C: Impeller type and centrifugal type
Secondary air is air that:
A: Is mixed with the fuel before the fuel reaches the burner
B: Is mixed with the fuel at the burner after the fuel has ignited
C: Remains unused after the combustion process is complete
D: Enters the draft diverter and goes up the stack with the products of combustion -
<<<<CORRECT ANSWERS>>>B: Is mixed with the fuel at the burner after the fuel has
ignited
The three major furnace configurations are:
A: Up-flow, down-flow and lowboy
B: Up-flow, down-flow and horizontal
C: Up-flow, down-flow and cross-flow
D: None of these is correct - <<<<CORRECT ANSWERS>>>B: Up-flow, down-flow and
horizontal
Residential gas furnaces use blowers powered by which types of motors?
A: Poly-phase, two phase, single phase and capacitor start
B: Shaded pole, split-phase, capacitor start and PSC
C: Three phase, shaded pole and PSC
D: Split-phase, induction start-induction run and variable speed DC - <<<<CORRECT
ANSWERS>>>D: Split-phase, induction start-induction run and variable speed DC
The horsepower range of residential heating blower motors is:
A: 1⁄8 to 1⁄16 hp
B: 1⁄4 to 1⁄2 hp
,C: 1⁄2 to 2 hp
D: 3⁄4 to 2 hp - <<<<CORRECT ANSWERS>>>B: 1⁄4 to 1⁄2 hp
A heat anticipator is wired:
A: In series with the "W" terminal
B: In parallel with the "W" terminal
C: In series with the "R" terminal
D: In parallel with the "R" terminal - <<<<CORRECT ANSWERS>>>A: In series with
the "W" terminal
Placing a jumper wire between the "R" terminal and the "G" terminal on a thermostat
subbase will energize the:
A: Gas valve
B: Indoor fan motor
C: Outdoor fan motor
D: Compressor - <<<<CORRECT ANSWERS>>>B: Indoor fan motor
Placing a jumper wire between the "R" terminal and the "W" terminal on a thermostat
sub-base will energize the:
A: Gas valve
B: Indoor fan motor
C: Outdoor fan motor
D: Compressor - <<<<CORRECT ANSWERS>>>A: Gas valve
Carbon monoxide is a:
A: Product of incomplete combustion
B: Poisonous gas
C: Odorless gas
, D: All of the above are correct - <<<<CORRECT ANSWERS>>>D: All of the above are
correct
The chemical symbol for carbon monoxide is:
A: CO2
B: CO
C: H2O
D: NH3 - <<<<CORRECT ANSWERS>>>B: CO
Selecting a lower speed tap setting on a furnace indoor blower motor will cause:
A: The temperature rise through the furnace to increase
B: The temperature rise through the furnace to decrease
C: The temperature rise through the furnace will not be affected
D: The furnace to act as a humidifier - <<<<CORRECT ANSWERS>>>A: The
temperature rise through the furnace to increase
"Carry over" channels or "cross overs" are used to:
A: Carry unused excess fuel back to the flue where it is sent up the stack
B: Carry primary air to the heat exchanger
C: Carry secondary air to the heat exchanger
D: Carry the flame from the first burner that lights to the remaining burners -
<<<<CORRECT ANSWERS>>>D: Carry the flame from the first burner that lights to the
remaining burners
Modern high-efficiency burners use combustion blowers. What are the two major types
of combustion blowers?
A: Induced draft and forced draft
B: High pressure and low pressure
C: Impeller type and centrifugal type
