Black smoke coming out of the chimney of a furnace is an indication of the use of _________ in the furnace.

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Nisha Gupta

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📊 Environmental Engineering

Q. Black smoke coming out of the chimney of a furnace is an indication of the use of _________ in the furnace.

(A) Low amount of excess combustion air
(B) Large quantity of excess combustion air
(C) Hydrocarbon fuel
(D) Pulverised coal as fuel

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✅ Correct Answer: (A) Low amount of excess combustion air

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