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Which among the following fuels need excess amount of air for complete combustion?

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Which among the following fuels need excess amount of air for complete combustion?

(a) Natural fuels

(b) Liquid fuels

(c) Gaseous fuels

(d) Artificial solid fuels

I got this question by my school teacher while I was bunking the class.

This interesting question is from Artificial Solid Fuels & Liquid Fuels in division Steam Power Plant of Energy Engineering

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Correct answer is (d) Artificial solid fuels

Explanation: Artificial solid fuels need excess amount of air for complete combustion because they have low calorific value compared to liquid fuels and the rate of combustion of solid fuels cannot be easily controlled. They have tendency to form clinkers at high temperatures.

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