During idling of a petrol engine requires

Q. During idling of a petrol engine requires

A

Air only

B

Lean mixture

C

Rich mixture

D

None of these

Solution:

The engine requires a rich mixture (more fuel than a stoichiometric mixture) for starting at idling to compensate for the charge dilution due to exhaust gases from the combustion chamber.
Exhaust gas dilution prevents efficient combustion by reducing the contact between the fuel and air particles.

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