Both the valves of a petrol engine are closed and piston moving towards spark plug during.

Intake stroke

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Exhaust stroke

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Compression stroke

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Expansion stroke

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Solution

The correct option is B Intake stroke
Both the valves of a petrol engine are closed and piston moving towards spark plug during Intake stroke.
the piston is moving downward and the intake valve is open. This downward movement of the piston produces a partial vacuum in the cylinder, and air and fuel rush into the cylinder past the open intake valve.

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