TSSA G3 Exam |304 Questions and Answers
(Gas Technician 3 Study Guide)
Natural gas and propane are: - -members of the hydrocarbon family
-Natural gas and propane are composed mainly of: - -carbon and hydrogen
-What is the odorant added to natural gas and propane? - -mercaptan
-85% to 95% of natural gas is composed of: - -methane
-Chemical formula for Methane: - -CH4
-Chemical formula for Propane: - -C3H8
-Chemical formula for Oxygen: - -O2
-Chemical formula for Nitrogen: - -N2
-Chemical formula for Water: - -H2O
-Chemical formula for Carbon Dioxide: - -CO2
-Chemical formula for Carbon Monoxide: - -CO
-The approximately percentage of oxygen and nitrogen in air is: - -21% Oxygen and 79%
Nitrogen
-The properties concerning natural gas and propane is on what page of the codebook? - -
351
-(T/F) Propane liquid escaping from a container rapidly drops in temperature - -True
-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? - -nitrogen
-What is the approximate dew point of the water vapour in combustion gases produced by
a property setup appliance? - -130 F (54 C)
-Carbon monoxide is: - -a toxic gas which is combustible
-Carbon monoxide is produced during the incomplete combustion of: - -hydrocarbon fuels
-Air supply to a gas-fired appliance includes: - -Air required for satisfactory combustion of
gas
Ambient air that is admitted into the venting system to control venting action
(Gas Technician 3 Study Guide)
Natural gas and propane are: - -members of the hydrocarbon family
-Natural gas and propane are composed mainly of: - -carbon and hydrogen
-What is the odorant added to natural gas and propane? - -mercaptan
-85% to 95% of natural gas is composed of: - -methane
-Chemical formula for Methane: - -CH4
-Chemical formula for Propane: - -C3H8
-Chemical formula for Oxygen: - -O2
-Chemical formula for Nitrogen: - -N2
-Chemical formula for Water: - -H2O
-Chemical formula for Carbon Dioxide: - -CO2
-Chemical formula for Carbon Monoxide: - -CO
-The approximately percentage of oxygen and nitrogen in air is: - -21% Oxygen and 79%
Nitrogen
-The properties concerning natural gas and propane is on what page of the codebook? - -
351
-(T/F) Propane liquid escaping from a container rapidly drops in temperature - -True
-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? - -nitrogen
-What is the approximate dew point of the water vapour in combustion gases produced by
a property setup appliance? - -130 F (54 C)
-Carbon monoxide is: - -a toxic gas which is combustible
-Carbon monoxide is produced during the incomplete combustion of: - -hydrocarbon fuels
-Air supply to a gas-fired appliance includes: - -Air required for satisfactory combustion of
gas
Ambient air that is admitted into the venting system to control venting action
