Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
May open and close anywhere

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

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

ANSWER DOWNLOAD EXAMIANS APP