TSSA G3 Exam www.Gastechnician.ca
UPDATED ACTUAL Exam Questions and
CORRECT 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
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
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
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
Air that is mixed with fuel at the point of combustion and around the flame is called: -
CORRECT ANSWER - secondary air
What is excess air? - CORRECT ANSWER - Air in the combustion zone in addition to
that which is required for combustion.
A long, yellow flame (or luminous/ carbonizing flame) on an atmospheric burner is caused by: -
CORRECT ANSWER - not premixing air and fuel prior to combustion
The flue gases from the complete combustion of natural gas in air are primarily: - CORRECT
ANSWER - Carbon dioxide, water vapour, nitrogen, excess air, heat and light
UPDATED ACTUAL Exam Questions and
CORRECT 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
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
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
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
Air that is mixed with fuel at the point of combustion and around the flame is called: -
CORRECT ANSWER - secondary air
What is excess air? - CORRECT ANSWER - Air in the combustion zone in addition to
that which is required for combustion.
A long, yellow flame (or luminous/ carbonizing flame) on an atmospheric burner is caused by: -
CORRECT ANSWER - not premixing air and fuel prior to combustion
The flue gases from the complete combustion of natural gas in air are primarily: - CORRECT
ANSWER - Carbon dioxide, water vapour, nitrogen, excess air, heat and light
