TSSA G3 Exam 2026 Questions and
Answers
Natural gas and propane are: - Correct Answer -members of the hydrocarbon
family
Natural gas and propane are composed mainly of: - Correct Answer -carbon and
hydrogen
What is the odorant added to natural gas and propane? - Correct Answer -
mercaptan
85% to 95% of natural gas is composed of: - Correct Answer -methane
Chemical formula for Methane: - Correct Answer -CH4
Chemical formula for Propane: - Correct Answer -C3H8
Chemical formula for Oxygen: - Correct Answer -O2
Chemical formula for Nitrogen: - Correct Answer -N2
Chemical formula for Water: - Correct Answer -H2O
Chemical formula for Carbon Dioxide: - Correct Answer -CO2
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,Chemical formula for Carbon Monoxide: - Correct Answer -CO
The approximately percentage of oxygen and nitrogen in air is: - Correct Answer -
21% Oxygen and 79% Nitrogen
The properties concerning natural gas and propane is on what page of the
codebook? - Correct Answer -351
(T/F) Propane liquid escaping from a container rapidly drops in temperature -
Correct Answer -True
What is L.E.L.? - Correct Answer -The lowest percent of gas in the air-gas mixture
that will support combustion
Odorant is added to natural gas at the: - Correct Answer -City gate station
The maximum flame temperature from the combustion of natural gas with air is: -
Correct Answer -3500 F
The two main hydrocarbons which form natural gas are: - Correct Answer -
methane and ethane
The boiling point of propane is: - Correct Answer --44 F
The boiling point of natural gas is: - Correct Answer --260 F
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,What is the ignition temperature of propane gas compared to natural gas? - Correct
Answer -Lower for propane
What is the ignition temperature of propane gas? - Correct Answer -920 to 1020 F
Is natural gas heavier or lighter than air? - Correct Answer -lighter
Is propane heavier or lighter than air? - Correct Answer -heavier
One imperial gallon of propane weighs: - Correct Answer -5.1 pounds (2.3
kilograms)
At 60°F (15,5° C) a pound of propane produces how many cubic feet of gas? -
Correct Answer -8.50
Propane shall have a distinctive odour content to ensure it is readily detectable in
the atmosphere down to concentrations of: - Correct Answer -20% of the lower
explosive limit.
When one pound of propane burns, it releases approximately: - Correct Answer -
21,600 Btu
The relative density of liquid propane as compared to water is approximately: -
Correct Answer -0.5
Propane is a: - Correct Answer -hydrocarbon
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, As the temperature of liquid propane in a tank increases, the vapour pressure of the
propane: - Correct Answer -increases
One boiler horsepower is approximately: - Correct Answer -34.000 Btuh (10 kW)
The "specific gravity of a gas (vapour)" is: - Correct Answer -the weight of the gas
as compared to the weight of an equal volume of air
Name the three elements required for combustion of any fuel? - Correct Answer -
Oxygen, Heat, and Fuel.
What would be the easiest to control or eliminate in a
leak situation (before a fire occurs) - Correct Answer -Shutting off the fuel
The products of perfect combustion of natural gas or propane with oxygen are: -
Correct Answer -water vapour, carbon dioxide, heat, and light
What air to gas ratio is required for the complete combustion of natural gas? -
Correct Answer -10 parts of air to 1 part of gas
What air to gas ratio is required for the complete combustion of propane? - Correct
Answer -24 parts of air to 1 part of gas
Air that is mixed with fuel prior to ignition is called: - Correct Answer -primary air
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Answers
Natural gas and propane are: - Correct Answer -members of the hydrocarbon
family
Natural gas and propane are composed mainly of: - Correct Answer -carbon and
hydrogen
What is the odorant added to natural gas and propane? - Correct Answer -
mercaptan
85% to 95% of natural gas is composed of: - Correct Answer -methane
Chemical formula for Methane: - Correct Answer -CH4
Chemical formula for Propane: - Correct Answer -C3H8
Chemical formula for Oxygen: - Correct Answer -O2
Chemical formula for Nitrogen: - Correct Answer -N2
Chemical formula for Water: - Correct Answer -H2O
Chemical formula for Carbon Dioxide: - Correct Answer -CO2
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,Chemical formula for Carbon Monoxide: - Correct Answer -CO
The approximately percentage of oxygen and nitrogen in air is: - Correct Answer -
21% Oxygen and 79% Nitrogen
The properties concerning natural gas and propane is on what page of the
codebook? - Correct Answer -351
(T/F) Propane liquid escaping from a container rapidly drops in temperature -
Correct Answer -True
What is L.E.L.? - Correct Answer -The lowest percent of gas in the air-gas mixture
that will support combustion
Odorant is added to natural gas at the: - Correct Answer -City gate station
The maximum flame temperature from the combustion of natural gas with air is: -
Correct Answer -3500 F
The two main hydrocarbons which form natural gas are: - Correct Answer -
methane and ethane
The boiling point of propane is: - Correct Answer --44 F
The boiling point of natural gas is: - Correct Answer --260 F
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,What is the ignition temperature of propane gas compared to natural gas? - Correct
Answer -Lower for propane
What is the ignition temperature of propane gas? - Correct Answer -920 to 1020 F
Is natural gas heavier or lighter than air? - Correct Answer -lighter
Is propane heavier or lighter than air? - Correct Answer -heavier
One imperial gallon of propane weighs: - Correct Answer -5.1 pounds (2.3
kilograms)
At 60°F (15,5° C) a pound of propane produces how many cubic feet of gas? -
Correct Answer -8.50
Propane shall have a distinctive odour content to ensure it is readily detectable in
the atmosphere down to concentrations of: - Correct Answer -20% of the lower
explosive limit.
When one pound of propane burns, it releases approximately: - Correct Answer -
21,600 Btu
The relative density of liquid propane as compared to water is approximately: -
Correct Answer -0.5
Propane is a: - Correct Answer -hydrocarbon
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, As the temperature of liquid propane in a tank increases, the vapour pressure of the
propane: - Correct Answer -increases
One boiler horsepower is approximately: - Correct Answer -34.000 Btuh (10 kW)
The "specific gravity of a gas (vapour)" is: - Correct Answer -the weight of the gas
as compared to the weight of an equal volume of air
Name the three elements required for combustion of any fuel? - Correct Answer -
Oxygen, Heat, and Fuel.
What would be the easiest to control or eliminate in a
leak situation (before a fire occurs) - Correct Answer -Shutting off the fuel
The products of perfect combustion of natural gas or propane with oxygen are: -
Correct Answer -water vapour, carbon dioxide, heat, and light
What air to gas ratio is required for the complete combustion of natural gas? -
Correct Answer -10 parts of air to 1 part of gas
What air to gas ratio is required for the complete combustion of propane? - Correct
Answer -24 parts of air to 1 part of gas
Air that is mixed with fuel prior to ignition is called: - Correct Answer -primary air
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