Internal Combustion Engines
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is

More
May be more or less depending on engine capacity
Less
Same

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at 50° before bottom dead center and closes at 15° after top dead center
May open and close anywhere
Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at bottom dead center and closes at top dead center

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