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When a cold engine is started, it requires a _____________ mixture.

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When a cold engine is started, it requires a _____________ mixture.

(a) leaner

(b) richer

(c) chemically equal

(d) none of the mentioned

I got this question during an interview for a job.

This intriguing question originated from Electronic Control System topic in chapter Electronic Injection Systems of IC Engine

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Right option is (b) richer

The explanation: For starting a cold engine, generally a richer mixture is required.

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