Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
Correct answer: C. Low amount of excess combustion air
- A. Hydrocarbon fuel
- B. Large quantity of excess combustion air
- C. Low amount of excess combustion air
- D. Pulverised coal as fuel
Explanation
Black smoke indicates incomplete combustion, usually because insufficient air is supplied to burn the fuel completely. Large excess air generally promotes more complete combustion and reduces soot formation.
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