When is the gas valve energized on an induced-draft furnace that uses hot surface ignition?
A) After the draft switch closes to prove the draft
B) On the initial call for heat
C) After the igniter has been energized
D) At the same time the induced draft blower is energized
C
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Which of the following can accelerate corrosion rates and damage vessels by overheating?
a. Overpressurization b. Underpressurization c. A vacuum within the vessel d. Changes in operating temperatures
When injection timing is advanced in a truck diesel engine, which of the following would NOT be true?
A. engine power is increased B. fuel economy is improved C. engine longevity is reduced D. engine emissions are reduced
How can emergent plants be discouraged from spreading too profusely?
What will be an ideal response?
High-volume efficiency means that more of the material leaving the gun stays on the surface being refinished.
Answer the following statement true (T) or false (F)