NGA 70 PROPERTIES OF NATURAL GAS AND ABNORMAL OPERATING
CONDITIONS EXAM QUESTIONS AND ANSWERS
Natural Gas - CORRECT ANSWER✅✅Mixture of methane, propane, ethane, cardbon dioxide, butane,
hydrogen, nitrogen. Gas cna be transported in gas or liquid state. Weight of gas is 0.6 air is 1.0. Propane
is heavier than air +1.0. Gas burns a clean blue flame.
Mercaptan - CORRECT ANSWER✅✅Odorant (sulfur) added to gas for smell detection of leaks. New
steel pipe may contribute to odor fade because of small rust deposits in the pipe.
Gravity of Gas - CORRECT ANSWER✅✅0.6
Gravity of Carbon Monoxide - CORRECT ANSWER✅✅0.96
Gravity of Air - CORRECT ANSWER✅✅1.0
Gravity of Propane - CORRECT ANSWER✅✅1.56
Gravity of Gasoline Vapors - CORRECT ANSWER✅✅3.5
Gravity of Fuel Oil Vapors - CORRECT ANSWER✅✅4.5
1 degree Fahrenheit (for every) - CORRECT ANSWER✅✅14 PSIG
7 Degree Fahrenheit (per) - CORRECT ANSWER✅✅100 PSIG
Highly Flammable - CORRECT ANSWER✅✅5% - 15%
15%-100% Gas - CORRECT ANSWER✅✅Too rich to burn but still considered highly flammable.
CONDITIONS EXAM QUESTIONS AND ANSWERS
Natural Gas - CORRECT ANSWER✅✅Mixture of methane, propane, ethane, cardbon dioxide, butane,
hydrogen, nitrogen. Gas cna be transported in gas or liquid state. Weight of gas is 0.6 air is 1.0. Propane
is heavier than air +1.0. Gas burns a clean blue flame.
Mercaptan - CORRECT ANSWER✅✅Odorant (sulfur) added to gas for smell detection of leaks. New
steel pipe may contribute to odor fade because of small rust deposits in the pipe.
Gravity of Gas - CORRECT ANSWER✅✅0.6
Gravity of Carbon Monoxide - CORRECT ANSWER✅✅0.96
Gravity of Air - CORRECT ANSWER✅✅1.0
Gravity of Propane - CORRECT ANSWER✅✅1.56
Gravity of Gasoline Vapors - CORRECT ANSWER✅✅3.5
Gravity of Fuel Oil Vapors - CORRECT ANSWER✅✅4.5
1 degree Fahrenheit (for every) - CORRECT ANSWER✅✅14 PSIG
7 Degree Fahrenheit (per) - CORRECT ANSWER✅✅100 PSIG
Highly Flammable - CORRECT ANSWER✅✅5% - 15%
15%-100% Gas - CORRECT ANSWER✅✅Too rich to burn but still considered highly flammable.
