1|Page
NS.M07.5741 EXAM||ACTUAL
QUESTIONS WITH ANSWERS 2026
Natural gas between the upper explosive limits and lower explosive limits
concentration is relatively harmless.
However, a source of ignition can be a simple as a spark given off by the
electronics inside a cell phone, doorbell, or even static electricity. - correct-
answer -What happens if there are no sources of ignition in the area of natural
gas?
5% natural gas (4% Indiana) - correct-answer -What is the Lower Explosive Limit
(LEL) of natural gas?
,2|Page
15% natural gas (14% Indiana) - correct-answer -What is the Upper Explosive
Limit (UEL) of natural gas?
10% natural gas - correct-answer -What percent gas is considered the most ideal
combustion mixture?
Odorization - correct-answer -What is the first line of defense against odorless
and combustible gases?
An odorant - correct-answer -What does the federal government mandate
combustible gas in distribution pipelines, and transmission lines, in class 3 and 4
locations contain?
The odorant must be added in such a way, that a person with a "normal sense of
smell", can detect it.
, 3|Page
This results in the gas concentration of 1/5th (20%) of the lower explosive limit
(LEL).
Maryland is more restrictive, requiring that gas be readily detectable at
concentrations in air of 1/10th of the LEL. - correct-answer -How must the
odorant be added?
Mercaptan - correct-answer -What is typically injected into the natural gas?
A chemical containing sulfur that produces a rotten egg or garlicky odor. - correct-
answer -What is mercaptan?
Odors that come from farm and/or ranch animals, industrial manufacturing
buildings, and soil types and conditions.
NS.M07.5741 EXAM||ACTUAL
QUESTIONS WITH ANSWERS 2026
Natural gas between the upper explosive limits and lower explosive limits
concentration is relatively harmless.
However, a source of ignition can be a simple as a spark given off by the
electronics inside a cell phone, doorbell, or even static electricity. - correct-
answer -What happens if there are no sources of ignition in the area of natural
gas?
5% natural gas (4% Indiana) - correct-answer -What is the Lower Explosive Limit
(LEL) of natural gas?
,2|Page
15% natural gas (14% Indiana) - correct-answer -What is the Upper Explosive
Limit (UEL) of natural gas?
10% natural gas - correct-answer -What percent gas is considered the most ideal
combustion mixture?
Odorization - correct-answer -What is the first line of defense against odorless
and combustible gases?
An odorant - correct-answer -What does the federal government mandate
combustible gas in distribution pipelines, and transmission lines, in class 3 and 4
locations contain?
The odorant must be added in such a way, that a person with a "normal sense of
smell", can detect it.
, 3|Page
This results in the gas concentration of 1/5th (20%) of the lower explosive limit
(LEL).
Maryland is more restrictive, requiring that gas be readily detectable at
concentrations in air of 1/10th of the LEL. - correct-answer -How must the
odorant be added?
Mercaptan - correct-answer -What is typically injected into the natural gas?
A chemical containing sulfur that produces a rotten egg or garlicky odor. - correct-
answer -What is mercaptan?
Odors that come from farm and/or ranch animals, industrial manufacturing
buildings, and soil types and conditions.
