The amount of combustible escaping unconsumed from the furnace, depends upon the________________?
Correct answer: B. All A., B. and C.
- A. Air supplied and furnace temperature
- B. All A., B. and C.
- C. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by
- D. change of direction)
- E. Burner design (thoroughness of mixing versus stratification)
Explanation
Unburned combustible losses depend on the available air and furnace temperature, burner mixing quality, air preheat, and gas-flow patterns that control contact between fuel and oxygen. Since each listed factor affects combustion completeness, the combined choice is appropriate.
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