In a S.I. engine burned white deposit on spark plug with molten globules indicates that the engine has been generally operating on

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Gopal Sharma

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📊 Automobile Engineering

Q. In a S.I. engine burned white deposit on spark plug with molten globules indicates that the engine has been generally operating on

(A) Most economical mixture
(B) Slightly rich mixture
(C) Stoichiometric mixture
(D) Too lean mixture

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✅ Correct Answer: (D) Too lean mixture

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