TSSA G3 Practice Questions and Correct
Answers
What is L.E.L.?
The lowest percent of gas in the air-gas mixture that will support combustion
Odorant is added to natural gas at the:
City gate station
The maximum flame temperature from the combustion of natural gas with air is:
3500 F
The two main hydrocarbons which form natural gas are:
methane and ethane
The boiling point of propane is:
-44 F
The boiling point of natural gas is:
-260 F
What is the ignition temperature of propane gas compared to natural gas?
Lower for propane
What is the ignition temperature of propane gas?
920 to 1020 F
Is natural gas heavier or lighter than air?
lighter
,Is propane heavier or lighter than air?
heavier
One imperial gallon of propane weighs:
5.1 pounds (2.3 kilograms)
At 60°F (15,5° C) a pound of propane produces how many cubic feet of gas?
8.50
Propane shall have a distinctive odour content to ensure it is readily detectable in the
atmosphere down to concentrations of:
20% of the lower explosive limit.
When one pound of propane burns, it releases approximately:
21,600 Btu
The relative density of liquid propane as compared to water is approximately:
0.5
Propane is a:
hydrocarbon
As the temperature of liquid propane in a tank increases, the vapour pressure of the
propane:
increases
One boiler horsepower is approximately:
34.000 Btuh (10 kW)
,The "specific gravity of a gas (vapour)" is:
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?
Oxygen, Heat, and Fuel.
What would be the easiest to control or eliminate in a
leak situation (before a fire occurs)
Shutting off the fuel
The products of perfect combustion of natural gas or propane with oxygen are:
water vapour, carbon dioxide, heat, and light
What air to gas ratio is required for the complete combustion of natural gas?
10 parts of air to 1 part of gas
What air to gas ratio is required for the complete combustion of propane?
24 parts of air to 1 part of gas
Air that is mixed with fuel prior to ignition is called:
primary air
Air that is mixed with fuel at the point of combustion and around the flame is called:
secondary air
What is excess air?
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:
not premixing air and fuel prior to combustion
The flue gases from the complete combustion of natural gas in air are primarily:
Carbon dioxide, water vapour, nitrogen, excess air, heat and light
Name four properties or characteristics of carbon monoxide gas.
Colourless, Odourless, Tasteless, and Combustible
Name four symptoms of carbon monoxide poisoning.
Dizziness, Headaches, Shortness of breath, and Nausea/ Vomiting
(T/F) Carbon Monoxide is toxic
True
Two undesirable products of incomplete combustion are:
Carbon monoxide and aldehydes
What refers to the air found in the products of combustion
after the complete combustion of natural gas or propane?
excess air
Carbon dioxide and nitrogen are:
inert gases
Which one of the following substances is inert and passes through the combustion zone
absorbing heat during the combustion process?
Answers
What is L.E.L.?
The lowest percent of gas in the air-gas mixture that will support combustion
Odorant is added to natural gas at the:
City gate station
The maximum flame temperature from the combustion of natural gas with air is:
3500 F
The two main hydrocarbons which form natural gas are:
methane and ethane
The boiling point of propane is:
-44 F
The boiling point of natural gas is:
-260 F
What is the ignition temperature of propane gas compared to natural gas?
Lower for propane
What is the ignition temperature of propane gas?
920 to 1020 F
Is natural gas heavier or lighter than air?
lighter
,Is propane heavier or lighter than air?
heavier
One imperial gallon of propane weighs:
5.1 pounds (2.3 kilograms)
At 60°F (15,5° C) a pound of propane produces how many cubic feet of gas?
8.50
Propane shall have a distinctive odour content to ensure it is readily detectable in the
atmosphere down to concentrations of:
20% of the lower explosive limit.
When one pound of propane burns, it releases approximately:
21,600 Btu
The relative density of liquid propane as compared to water is approximately:
0.5
Propane is a:
hydrocarbon
As the temperature of liquid propane in a tank increases, the vapour pressure of the
propane:
increases
One boiler horsepower is approximately:
34.000 Btuh (10 kW)
,The "specific gravity of a gas (vapour)" is:
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?
Oxygen, Heat, and Fuel.
What would be the easiest to control or eliminate in a
leak situation (before a fire occurs)
Shutting off the fuel
The products of perfect combustion of natural gas or propane with oxygen are:
water vapour, carbon dioxide, heat, and light
What air to gas ratio is required for the complete combustion of natural gas?
10 parts of air to 1 part of gas
What air to gas ratio is required for the complete combustion of propane?
24 parts of air to 1 part of gas
Air that is mixed with fuel prior to ignition is called:
primary air
Air that is mixed with fuel at the point of combustion and around the flame is called:
secondary air
What is excess air?
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:
not premixing air and fuel prior to combustion
The flue gases from the complete combustion of natural gas in air are primarily:
Carbon dioxide, water vapour, nitrogen, excess air, heat and light
Name four properties or characteristics of carbon monoxide gas.
Colourless, Odourless, Tasteless, and Combustible
Name four symptoms of carbon monoxide poisoning.
Dizziness, Headaches, Shortness of breath, and Nausea/ Vomiting
(T/F) Carbon Monoxide is toxic
True
Two undesirable products of incomplete combustion are:
Carbon monoxide and aldehydes
What refers to the air found in the products of combustion
after the complete combustion of natural gas or propane?
excess air
Carbon dioxide and nitrogen are:
inert gases
Which one of the following substances is inert and passes through the combustion zone
absorbing heat during the combustion process?
