NGA 70 - AOCs & Properties of Natural Gas Exam
Questions and Correct Answers | Updated 2026/2027
|Graded A+.
Specific Gravity Natural Gas - ANSWER- 0.6
Specific Gravity Carbon Monoxide - ANSWER- 0.98
Specific Gravity Air - ANSWER- 1.0
Specific Gravity Propane - ANSWER- 3.5
Gases with a specific gravity greater than 1 tend to - ANSWER- hug the ground
Headaches, Dizziness, Loss of consciousness are symptoms of - ANSWER- exposure to high
levels of natural gas
Odorant added to natural gas before distribution to help aid in detecting gas leaks -
ANSWER- Mercaptan
Odor intensity can decrease by passing through - ANSWER- sand, clay, or loam
Specific Gravity Kerosene/Fuel Oil - ANSWER- 4.5
Natural Gas can be transported in either - ANSWER- Gas or Liquid
Odor intensity can decrease by presence of - ANSWER- household chemicals, kitchen or
bathroom cleaners, some air freshners
, Odor Fade is caused by what in Steel Pipes - ANSWER- internal rust deposits
Odor Fade occurs in Plastic Pipes - ANSWER- absorbed into or absorbed onto the surface of
the pipe until the pipe comes saturated
Two Specific Reasons to know gravity of fuel gases (2) - ANSWER- Can influence safety if the
gas is released into the atmosphere
The major component of fuel gas - ANSWER- hydrocarbons
The major component of natural gas - ANSWER- methane
Natural gas is generally composed of what percentage of methane? - ANSWER- 90%-
95%
When heated, natural gas will - ANSWER- expand
Two Specific Reasons to know gravity of fuel gases (1) - ANSWER- It can affect combustion
properties at burner tip
When cooled, natural gas will - ANSWER- contract
if gas falls below 32 degrees - ANSWER- frost ball of frozen soil can form around underground
pipe
undue stress on the pipe happens when - ANSWER- gas temperature falls below 32 degrees
internal freezing of pressure regulators, poor pressure of line blockage or meter blockages are
caused by - ANSWER- Moisture condensing in a pipeline
Questions and Correct Answers | Updated 2026/2027
|Graded A+.
Specific Gravity Natural Gas - ANSWER- 0.6
Specific Gravity Carbon Monoxide - ANSWER- 0.98
Specific Gravity Air - ANSWER- 1.0
Specific Gravity Propane - ANSWER- 3.5
Gases with a specific gravity greater than 1 tend to - ANSWER- hug the ground
Headaches, Dizziness, Loss of consciousness are symptoms of - ANSWER- exposure to high
levels of natural gas
Odorant added to natural gas before distribution to help aid in detecting gas leaks -
ANSWER- Mercaptan
Odor intensity can decrease by passing through - ANSWER- sand, clay, or loam
Specific Gravity Kerosene/Fuel Oil - ANSWER- 4.5
Natural Gas can be transported in either - ANSWER- Gas or Liquid
Odor intensity can decrease by presence of - ANSWER- household chemicals, kitchen or
bathroom cleaners, some air freshners
, Odor Fade is caused by what in Steel Pipes - ANSWER- internal rust deposits
Odor Fade occurs in Plastic Pipes - ANSWER- absorbed into or absorbed onto the surface of
the pipe until the pipe comes saturated
Two Specific Reasons to know gravity of fuel gases (2) - ANSWER- Can influence safety if the
gas is released into the atmosphere
The major component of fuel gas - ANSWER- hydrocarbons
The major component of natural gas - ANSWER- methane
Natural gas is generally composed of what percentage of methane? - ANSWER- 90%-
95%
When heated, natural gas will - ANSWER- expand
Two Specific Reasons to know gravity of fuel gases (1) - ANSWER- It can affect combustion
properties at burner tip
When cooled, natural gas will - ANSWER- contract
if gas falls below 32 degrees - ANSWER- frost ball of frozen soil can form around underground
pipe
undue stress on the pipe happens when - ANSWER- gas temperature falls below 32 degrees
internal freezing of pressure regulators, poor pressure of line blockage or meter blockages are
caused by - ANSWER- Moisture condensing in a pipeline
