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What was used as fuel during the early invention of IC engines?

(a) Gun-powder

(b) Petrol

(c) Potassium

(d) Kerosene

The question was posed to me in an interview.

This intriguing question originated from Internal Combustion Engine in portion Design of IC Engine Components of Automotive Engine Design

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Correct answer is (a) Gun-powder

The best explanation: In the 1600s, Gun powder was available as explosive, Huygen invented and engine that uses gunpowder as the fuel. Petrol and kerosene didn’t exist in those days and potassium is not used in the engine till today.

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