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A thermocouple is used with:
A: Intermittent pilot systems
B: Direct spark ignition systems
C: Glow coil ignition systems
D: Standing pilot ignition systems - Answer-D: Standing
pilot ignition systems
The purpose of the gas pressure regulator is to:
A: Keep the color of the flame constant
B: Keep the high limit switch from tripping
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C: Maintain a constant gas pressure at the burner
D: Allow the gas valve to operate smoothly and accurately
- Answer-C: Maintain a constant gas pressure at the
burner
The instrument used to measure outlet gas pressure is
the:
A: Velometer
B: Anemometer
C: Monometer
D: Draft gauge - Answer-C: Monometer
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:
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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.
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A: 85%
B: 90%
C: 100%
D: 110% - Answer-B: 90%
The regulator on a natural gas furnace should be adjusted
to supply _____ inches of pressure at the burners.
A: 11"
B: 10"
C: 3.5"
D: 2" - Answer-C: 3.5"