HVAC (GAS HEAT) MASTER TEST EXAM
QUESTIONS WITH CORRECT ANSWERS
The maximum allowable concentration of continuous 24hr exposure of Carbon
monoxide according to ASHRAE is about ___________ - Answer-0.009 ppm
When burning natural gas, the air adjustment is generally made to secure as
__________ a flame as possible - Answer-Blue
___________ on pipes and pipe fittings should be located by spreading a soap solution
over the surface - Answer-Gas Leaks
Which of the following gas is the main constituent in Natural gas - Answer-Methane
A yellow flame indicates dependence entirely on ______ air for combustion - Answer-
Secondary
The primary air is admitted at a ratio of about _______ parts primary air to 1 part gas for
natural gas - Answer-10
During incomplete combustion which of the following is produced - Answer-CO
Propane is ______ than air - Answer-Heavier
Natural gas has a specific gravity of _____ - Answer-0.6
Which fittings should NOT be used for the main gas line - Answer-Aluminum tubing
OSHA standards prohibit worker exposure to Carbon monoxide not more than _____
PPM air averaged during an 8 hour period - Answer-50
Install the main manual gas shutoff valve on the riser at least _______ above the floor
level - Answer-4 ft
The Bunsen burner flame is practically _________ - Answer-Nonluminous
The burner tube of an ________ is commonly a straight, adjustable venturi that extends
horizontally from the unit - Answer-Inshot Gas Burner
A ___________ is used to ensure the maintenance of constant lowdraft conditions in
the combustion chamber with a resultant stability of air supply - Answer-Draft Hood
LPG has a heating capacity of approximately _______ Btu per cubic foot - Answer-2500
, What is Required for proper combustion - Answer-Fuel, Ignition, Oxygen
Line Burners can produce over _____ BTU/Hr per foot of length - Answer-1,000,000
During complete combustion which of the following is produced - Answer-CO2, H2O,
O2
The percentage of carbon dioxide in the flue gases for natural gas should be about
______ - Answer-7 to 9%
Fuel heating value of Natural gas will be in the range of ______ Btu/ft^3 - Answer-900 -
1200
Install the pilot valve on the ______ side of the main manual gas shutoff valve - Answer-
Inlet
The _______ air is drawn into the burner by natural draft - Answer-Secondary
What are the primary constituents of Liquid Petroleum Gas (LPG) - Answer-Butane,
Propane
Most atmospheric injection burners operate efficiently on _______ of the theoretical
value - Answer-40 to 60%
soldered or sweated connections are also not recommended in ________ - Answer-Gas
piping, oil piping
Which of the following gas is lighter than air - Answer-Natural Gas
All electrical connection to heating appliances shall comply with - Answer-NEC
Which of the following gas is not a constituent of Natural gas - Answer-Acetane
A customer tells a technician that his six month old furnace stops heating before the
residence is warm. This happens only on very cold nights. The technician lights the
furnace, and tries to adjust the gas valve, but the flames do not change. He suspects: -
Answer-a defective gas valve regulator.
A technician connects the electrical circuit to an 80,000 BTU gas furnace with a 3-ton
cooling system. The fan motor is rated 1/3 HP @ 120 VAC. What size conductor would
normally be used? (copper conductors) - Answer-12-14 AWG
A customer complains that a 2-year-old gas furnace will not light. The technician
determines that the furnace locks out while attempting to light. He reads 19 VAC at the
input of the electroinc board and the gas valve. The technician concludes: - Answer-the
transformer could be faulty.
QUESTIONS WITH CORRECT ANSWERS
The maximum allowable concentration of continuous 24hr exposure of Carbon
monoxide according to ASHRAE is about ___________ - Answer-0.009 ppm
When burning natural gas, the air adjustment is generally made to secure as
__________ a flame as possible - Answer-Blue
___________ on pipes and pipe fittings should be located by spreading a soap solution
over the surface - Answer-Gas Leaks
Which of the following gas is the main constituent in Natural gas - Answer-Methane
A yellow flame indicates dependence entirely on ______ air for combustion - Answer-
Secondary
The primary air is admitted at a ratio of about _______ parts primary air to 1 part gas for
natural gas - Answer-10
During incomplete combustion which of the following is produced - Answer-CO
Propane is ______ than air - Answer-Heavier
Natural gas has a specific gravity of _____ - Answer-0.6
Which fittings should NOT be used for the main gas line - Answer-Aluminum tubing
OSHA standards prohibit worker exposure to Carbon monoxide not more than _____
PPM air averaged during an 8 hour period - Answer-50
Install the main manual gas shutoff valve on the riser at least _______ above the floor
level - Answer-4 ft
The Bunsen burner flame is practically _________ - Answer-Nonluminous
The burner tube of an ________ is commonly a straight, adjustable venturi that extends
horizontally from the unit - Answer-Inshot Gas Burner
A ___________ is used to ensure the maintenance of constant lowdraft conditions in
the combustion chamber with a resultant stability of air supply - Answer-Draft Hood
LPG has a heating capacity of approximately _______ Btu per cubic foot - Answer-2500
, What is Required for proper combustion - Answer-Fuel, Ignition, Oxygen
Line Burners can produce over _____ BTU/Hr per foot of length - Answer-1,000,000
During complete combustion which of the following is produced - Answer-CO2, H2O,
O2
The percentage of carbon dioxide in the flue gases for natural gas should be about
______ - Answer-7 to 9%
Fuel heating value of Natural gas will be in the range of ______ Btu/ft^3 - Answer-900 -
1200
Install the pilot valve on the ______ side of the main manual gas shutoff valve - Answer-
Inlet
The _______ air is drawn into the burner by natural draft - Answer-Secondary
What are the primary constituents of Liquid Petroleum Gas (LPG) - Answer-Butane,
Propane
Most atmospheric injection burners operate efficiently on _______ of the theoretical
value - Answer-40 to 60%
soldered or sweated connections are also not recommended in ________ - Answer-Gas
piping, oil piping
Which of the following gas is lighter than air - Answer-Natural Gas
All electrical connection to heating appliances shall comply with - Answer-NEC
Which of the following gas is not a constituent of Natural gas - Answer-Acetane
A customer tells a technician that his six month old furnace stops heating before the
residence is warm. This happens only on very cold nights. The technician lights the
furnace, and tries to adjust the gas valve, but the flames do not change. He suspects: -
Answer-a defective gas valve regulator.
A technician connects the electrical circuit to an 80,000 BTU gas furnace with a 3-ton
cooling system. The fan motor is rated 1/3 HP @ 120 VAC. What size conductor would
normally be used? (copper conductors) - Answer-12-14 AWG
A customer complains that a 2-year-old gas furnace will not light. The technician
determines that the furnace locks out while attempting to light. He reads 19 VAC at the
input of the electroinc board and the gas valve. The technician concludes: - Answer-the
transformer could be faulty.
