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What is the stoichiometric air-fuel ratio of diesel?

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What is the stoichiometric air-fuel ratio of diesel?

(a) 50: 1

(b) 14.7:  1

(c) 25: 1

(d) 14.5: 1

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Question is from Carburettors topic in section Fuel Supply System of Automobile Engineering

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Correct option is (d) 14.5: 1

Explanation: The stoichiometric air-fuel ratio of diesel is 14.5: 1. The stoichiometric air-fuel ratio of petrol is 14.7: 1. The mixture which contains less air than the stoichiometric requirement is called a rich mixture.

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