Q.

During which of the following operating conditions of an auto-mobile, carbon monoxide content in exhaust gas is maximum?

A. Acceleration
B. Cruising
C. Idle running
D. Deacceleration
Answer» C. Idle running
Explanation: High Carbon Monoxide (CO) content in exhaust gas of automobiles usually indicate a fuel mixture richer than ideal (rich mixture - air fuel ratio below 14.7).
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