1
FINAL MECH FOR GAS ACTUAL
2025/2026 QUESTIONS AND 100%
CORRECT ANSWERS
20 cubic feet of propane will produce how many Btu of heat? - (ANSWER)50,000
All fuels contain hydrogen and ___________ atoms. - (ANSWER)Carbon
All fuel-air mixture in which there is not enough fuel for combustion is
_______________. - (ANSWER)Lean
For perfect combustion, propane requires ________ cubic feet of air per cubic
foot of gas. - (ANSWER)23.5
For practical combustion, most manufactures use _____ excess air. -
(ANSWER)50%
How many cubic feet of air does it take to produce 1 cubic foot of oxygen. -
(ANSWER)5
In a conventional gas furnace, the hot flue gases are ____. - (ANSWER)Vented by
natural convection
Propane has a heat content of ________ BTU per cubic foot. - (ANSWER)2,500
, 2
The chemical formula for natural gas is _______________. - (ANSWER)CH4
The dangerous by-product of poor combustion of gas is ___________________. -
(ANSWER)Carbon monoxide
The ignition temperature for methane is ___________ degrees Fahrenheit. -
(ANSWER)1170
The measure most accepted for calculating natural gas consumption is
___________ Btu per cubic foot. - (ANSWER)1000
The pilot burner is actually a burner assembly that contains which of the following
component - (ANSWER)e. all components listed are found in a pilot burner
Correct
If a flame tip is yellow, it is a sign of a(n) ______________. - (ANSWER)Lack of
primary air
The specific gravity of natural gas is _____. - (ANSWER)0.6
The ignition temperature for propane is ____ degrees Fahrenheit. - (ANSWER)900
FINAL MECH FOR GAS ACTUAL
2025/2026 QUESTIONS AND 100%
CORRECT ANSWERS
20 cubic feet of propane will produce how many Btu of heat? - (ANSWER)50,000
All fuels contain hydrogen and ___________ atoms. - (ANSWER)Carbon
All fuel-air mixture in which there is not enough fuel for combustion is
_______________. - (ANSWER)Lean
For perfect combustion, propane requires ________ cubic feet of air per cubic
foot of gas. - (ANSWER)23.5
For practical combustion, most manufactures use _____ excess air. -
(ANSWER)50%
How many cubic feet of air does it take to produce 1 cubic foot of oxygen. -
(ANSWER)5
In a conventional gas furnace, the hot flue gases are ____. - (ANSWER)Vented by
natural convection
Propane has a heat content of ________ BTU per cubic foot. - (ANSWER)2,500
, 2
The chemical formula for natural gas is _______________. - (ANSWER)CH4
The dangerous by-product of poor combustion of gas is ___________________. -
(ANSWER)Carbon monoxide
The ignition temperature for methane is ___________ degrees Fahrenheit. -
(ANSWER)1170
The measure most accepted for calculating natural gas consumption is
___________ Btu per cubic foot. - (ANSWER)1000
The pilot burner is actually a burner assembly that contains which of the following
component - (ANSWER)e. all components listed are found in a pilot burner
Correct
If a flame tip is yellow, it is a sign of a(n) ______________. - (ANSWER)Lack of
primary air
The specific gravity of natural gas is _____. - (ANSWER)0.6
The ignition temperature for propane is ____ degrees Fahrenheit. - (ANSWER)900
