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Mean effective pressure at a given compression ratio is maximum when the air fuel ratio is?

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Mean effective pressure at a given compression ratio is maximum when the air fuel ratio is?

(a) higher than stoichiometric

(b) lower than stoichiometric

(c) equal to stoichiometric

(d) none of the mentioned

The question was posed to me during an online interview.

The above asked question is from Effects of Operating Variables in division Fuel Air and Actual Cycles and their Analysis of IC Engine

1 Answer

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Right answer is (b) lower than stoichiometric

To explain I would say: When the air fuel ratio is lower than stoichiometric then only the mean effective pressure at a given compression ratio is maximum.

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