NGA 70 Properties of Natural Gas UPDATED ACTUAL Questions And Correct
Answers
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Terms in this set (42)
Natural gas lower than 5% Will not burn
Gas to air mixtures approximately 5 to 15% will Burn
Gas to air mixtures about 15% are Too rich to burn, but are still considered hazardous atmospheres
5% of natural gas and air mixture is called Lower explosive limit
15% of natural gas and air mixture is called Upper explosive limit
The combustible material in natural gas are Hydrocarbons
What does come combustion result from? A chemical action between oxygen in the air, and the hydrogen and carbon in
hydrocarbon gases
How does complete combustion occur and what From a perfect Mixture of fuel, gas and oxygen, resulting in combustion products
products come from it? of water and carbon dioxide
How does incomplete combustion occur and what can Improper mixture of fuel, gas and oxygen, such as too much fuel, or not enough,
combustion products come from it? oxygen, resulting in combustion products of water and carbon dioxide and by-
products, including carbon monoxide an aldehydes
Clean burn flame Blue
Burner out of adjustment, flame color Yellow
What is a way you could tell incomplete combustion is A short, pungent odor may be present indicating the presence of aldehydes
occurring, and the appliance is not properly vented
natural gas ignition temperature 1100
Propane, ignition temperature 874
Butane ignition temperature 806
Gasoline, kerosene fuel oil, ignition temperature 490
Answers
C
Terms in this set (42)
Natural gas lower than 5% Will not burn
Gas to air mixtures approximately 5 to 15% will Burn
Gas to air mixtures about 15% are Too rich to burn, but are still considered hazardous atmospheres
5% of natural gas and air mixture is called Lower explosive limit
15% of natural gas and air mixture is called Upper explosive limit
The combustible material in natural gas are Hydrocarbons
What does come combustion result from? A chemical action between oxygen in the air, and the hydrogen and carbon in
hydrocarbon gases
How does complete combustion occur and what From a perfect Mixture of fuel, gas and oxygen, resulting in combustion products
products come from it? of water and carbon dioxide
How does incomplete combustion occur and what can Improper mixture of fuel, gas and oxygen, such as too much fuel, or not enough,
combustion products come from it? oxygen, resulting in combustion products of water and carbon dioxide and by-
products, including carbon monoxide an aldehydes
Clean burn flame Blue
Burner out of adjustment, flame color Yellow
What is a way you could tell incomplete combustion is A short, pungent odor may be present indicating the presence of aldehydes
occurring, and the appliance is not properly vented
natural gas ignition temperature 1100
Propane, ignition temperature 874
Butane ignition temperature 806
Gasoline, kerosene fuel oil, ignition temperature 490
