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Anti-knock characteristics of alcohol when compared to gasoline is?

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Anti-knock characteristics of alcohol when compared to gasoline is?

(a) higher

(b) lower

(c) equal

(d) none of the mentioned

This question was posed to me in an online interview.

This intriguing question comes from Surface Ignition Alcohol C.I. Engine in section Conventional and Alternate Fuels of IC Engine

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Best answer
The correct option is (a) higher

Explanation: Anti-knock characteristics of alcohol when compared to gasoline is higher and stoichiometric air-fuel ratio of alcohol when compared to gasoline is generally lower.

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