GAS HEATING CERTIFICATION
PRACTICE EXAM QUESTIONS AND
ANSWERS
The three elements of combustion are - Answer-Fuel, oxygen and ignition
Which of the following is a natural result of combustion - Answer-Water Vapor
Primary 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 -
Answer-A- Is mixed with the fuel before the fuel reaches the burner
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 -
Answer-B- Is mixed with the fuel at the burner after the fuel has ignited
The three major furnace configurations are - Answer-upflow , downflow and horizontal
Residential gas furnaces use blowers powered by which types of motors - Answer-Split-
phase, induction start-induction run and variable speed DC
The horsepower range of residential heating blower motors is - Answer-1/4 - 1/2 hp
A heat anticipator is wired - Answer-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 - Answer-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 - Answer-A- Gas valve
Carbon monoxide is a - Answer-Product of complete combustion
Poisonous gas
Odorless gas
The chemical symbol for carbon monoxide is - Answer-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 - Answer-A - The temperature rise through the
furnace to increase
"Carry over" channels or "cross overs" are used to - Answer-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
PRACTICE EXAM QUESTIONS AND
ANSWERS
The three elements of combustion are - Answer-Fuel, oxygen and ignition
Which of the following is a natural result of combustion - Answer-Water Vapor
Primary 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 -
Answer-A- Is mixed with the fuel before the fuel reaches the burner
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 -
Answer-B- Is mixed with the fuel at the burner after the fuel has ignited
The three major furnace configurations are - Answer-upflow , downflow and horizontal
Residential gas furnaces use blowers powered by which types of motors - Answer-Split-
phase, induction start-induction run and variable speed DC
The horsepower range of residential heating blower motors is - Answer-1/4 - 1/2 hp
A heat anticipator is wired - Answer-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 - Answer-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 - Answer-A- Gas valve
Carbon monoxide is a - Answer-Product of complete combustion
Poisonous gas
Odorless gas
The chemical symbol for carbon monoxide is - Answer-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 - Answer-A - The temperature rise through the
furnace to increase
"Carry over" channels or "cross overs" are used to - Answer-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
