Internal Combustion Engines
In a four stroke cycle petrol engine, the charge is ignited at

30° after top dead center
30° after bottom dead center
30° before bottom dead center
30° before top dead center

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

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
Opens at 50° before bottom dead center and closes at 15° after top dead center

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