1|Page
CFESA Gas Exam 2026 Most Recent Exam / Actual
Complete Real Exam Questions And Correct
Answers||Verified Exam!!! (Verified Answers) Already
Graded / A+ Guaranteed Success!! Newest Exam!!!
If carbon monoxide is being produced, will there be
aldehydes? - Answers-No, not always
If there are aldehydes, is there carbon monoxide present?
- Answers-yes
What determines how much carbon dioxide your blood
absorbs? - Answers-the concentration in air, and exposure
length
What is primary air? - Answers-Air that enters through the
burner venturi.
What is secondary air? - Answers-Air surrounding the
burner, the air in the room
How is primary air controlled? - Answers-Air shutters at
the inlet of the burner.
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What is the hottest part of a flame? - Answers-light blue
outer cone
What causes flames to lift off of a burner and maintain
their shape? - Answers-excessive gas pressure or primary
air
What causes flames with yellow tips? - Answers-
Insufficient primary air
What causes an almost totally yellow flame? - Answers-No
primary air
What causes a shapeless flame to flow totally off of the
burner? - Answers-lack of secondary air
In a confined space, combustion air openings must be
located where? - Answers-12in from the floor and 12in
from the ceiling
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The minimum area allowed for a fresh air opening is what
size? - Answers-100 sq inches
A confined space connected to an unconfined space
requires the combustion air opening of one square inch for
every _____ Btus? - Answers-1000, with a minimum of
100sq in
Where does natural gas come from? - Answers-Wells
deep in the ground
Where does LP gas come from? - Answers-byproduct of
crude oil, and some is from natural gas pockets
What are the three different gases often termed as LP
gas? - Answers-butane, ethane, propane
Are LP tanks filled with gas or liquid? - Answers-Liquid
What happens in a LP tank as gas is drawn off? -
Answers-The liquid boils off and creates additional gas.
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Does natural gas have any odor? - Answers-No, not when
it comes from the ground and is cleaned
What is meant by the "specific gravity" of as gas? -
Answers-the weight of gas compared to the weight of air
Is natural gas heavier or lighter than air? - Answers-Lighter
Is LP gas heavier or lighter than air? - Answers-Heavier
Why is LP gas more dangerous to work with than natural
gas? - Answers-LP is heavier than air so it does not
dissipate, and is more volatile
What is the heating value of a cubic foot of natural gas? -
Answers-Approx. 1000 Btu/cu. ft. Varies from 950 to 1150
btus
What is the heating value for LP gas? - Answers-2500
Btu/cu. ft.
CFESA Gas Exam 2026 Most Recent Exam / Actual
Complete Real Exam Questions And Correct
Answers||Verified Exam!!! (Verified Answers) Already
Graded / A+ Guaranteed Success!! Newest Exam!!!
If carbon monoxide is being produced, will there be
aldehydes? - Answers-No, not always
If there are aldehydes, is there carbon monoxide present?
- Answers-yes
What determines how much carbon dioxide your blood
absorbs? - Answers-the concentration in air, and exposure
length
What is primary air? - Answers-Air that enters through the
burner venturi.
What is secondary air? - Answers-Air surrounding the
burner, the air in the room
How is primary air controlled? - Answers-Air shutters at
the inlet of the burner.
,2|Page
What is the hottest part of a flame? - Answers-light blue
outer cone
What causes flames to lift off of a burner and maintain
their shape? - Answers-excessive gas pressure or primary
air
What causes flames with yellow tips? - Answers-
Insufficient primary air
What causes an almost totally yellow flame? - Answers-No
primary air
What causes a shapeless flame to flow totally off of the
burner? - Answers-lack of secondary air
In a confined space, combustion air openings must be
located where? - Answers-12in from the floor and 12in
from the ceiling
,3|Page
The minimum area allowed for a fresh air opening is what
size? - Answers-100 sq inches
A confined space connected to an unconfined space
requires the combustion air opening of one square inch for
every _____ Btus? - Answers-1000, with a minimum of
100sq in
Where does natural gas come from? - Answers-Wells
deep in the ground
Where does LP gas come from? - Answers-byproduct of
crude oil, and some is from natural gas pockets
What are the three different gases often termed as LP
gas? - Answers-butane, ethane, propane
Are LP tanks filled with gas or liquid? - Answers-Liquid
What happens in a LP tank as gas is drawn off? -
Answers-The liquid boils off and creates additional gas.
, 4|Page
Does natural gas have any odor? - Answers-No, not when
it comes from the ground and is cleaned
What is meant by the "specific gravity" of as gas? -
Answers-the weight of gas compared to the weight of air
Is natural gas heavier or lighter than air? - Answers-Lighter
Is LP gas heavier or lighter than air? - Answers-Heavier
Why is LP gas more dangerous to work with than natural
gas? - Answers-LP is heavier than air so it does not
dissipate, and is more volatile
What is the heating value of a cubic foot of natural gas? -
Answers-Approx. 1000 Btu/cu. ft. Varies from 950 to 1150
btus
What is the heating value for LP gas? - Answers-2500
Btu/cu. ft.
