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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at top dead center and ends at bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
May start and end anywhere

ANSWER DOWNLOAD EXAMIANS APP