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

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

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at 10° after top dead center and closes 20° before the bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center

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