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____________ is a chemical reaction in which certain elements of the fuel like hydrogen and carbon combine with oxygen liberating heat energy and causing an increase in temperature of the gases.

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____________ is a chemical reaction in which certain elements of the fuel like hydrogen and carbon combine with oxygen liberating heat energy and causing an increase in temperature of the gases.

(a) Compression

(b) Expansion

(c) Combustion

(d) None of the mentioned

I have been asked this question by my college professor while I was bunking the class.

The question is from Combustion topic in division Combustion and Combustion Chambers of IC Engine

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The correct choice is (c) Combustion

Easy explanation: Combustion is a chemical reaction in which certain elements of the fuel like hydrogen and carbon combine with oxygen liberating heat energy and causing an increase in temperature of the gases, while expansion and compression are not reactions, in fact they are processes in a fuel cycle.

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