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The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in air fuel ratio. The maximum value occurs in the range of ____________

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The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in air fuel ratio. The maximum value occurs in the range of ____________

(a) lean mixture

(b) chemically correct mixture

(c) rich mixture

(d) none of the mentioned

This question was posed to me in an interview for internship.

My question is based upon Air Fuel Mixtures topic in section Carburetion of IC Engine

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Best answer
The correct option is (a) lean mixture

The best I can explain: The maximum value occurs in the range of lean mixture.

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