Gas Heating Certification Practice Exam Questions and Answers
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Course
Gas Master
Institution
Gas Master
Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than:
A: 70%
B: 75%
C: 78%
D: 80% - Answer-C -78%
Many pre-1992 furnaces have efficiencies around _______.
A: 10%
B: 40%
...
Gas Heating Certification Practice Exam
Questions and Answers
Since 1992, the United States Department of Energy has required that all furnaces sold
and installed from that date on must have an AFUE of no less than:
A: 70%
B: 75%
C: 78%
D: 80% - Answer-C -78%
Many pre-1992 furnaces have efficiencies around _______.
A: 10%
B: 40%
C: 60%
D: 80% - Answer-C-60%
Today, furnaces with AFUE ratings greater than _____ are available.
A: 85%
B: 90%
C: 100%
D: 110% - Answer-B-90%
A thermocouple is used with - Answer-Standing pilot ignition systems
The purpose of the gas pressure regulator is to - Answer-Maintain a constant gas
pressure at the burner
The instrument used to measure outlet gas pressure is the - Answer-Monometer
The regulator on a natural gas furnace should be adjusted to supply ___ inches of
pressure at the burners - Answer-3.5
, Burning one cubic foot of natural gas releases approximately _____ btu.
A: 800
B: 1,050
C: 12,000
D: 15,000 - Answer-B-1050
Under ideal conditions natural gas has an ignition temperature of ___ degree F and a
burning temperature of ___ degrees F - Answer-1,100 degrees, 3,500 degrees
Propane and butane are both:
A: Lighter than air
B: Heavier than air
C: Weigh the same as air
D: None of the above - Answer-B - heavier than air
In order to achieve complete combustion with natural gas, each cubic foot of gas must
combine with no less than ______ cubic feet of air with an additional 5 cubic feet of
extra air to ensure there is enough oxygen for complete combustion.
The three elements of combustion are - Answer-Fuel, oxygen and ignition
Which of the following is a natural result of combustion - Answer-Water Vapor
Primary air is air that:
A: Is mixed with the fuel before the fuel reaches the burner
B: Is mixed with the fuel at the burner after the fuel has ignited
C: Remains unused after the combustion process is complete
D: Enters the draft diverter and goes up the stack with the products of combustion -
Answer-A- Is mixed with the fuel before the fuel reaches the burner
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