Internal Combustion Engines
In the opposed piston diesel engine, the combustion chamber is located

Above the piston
There is no such criterion
Between the pistons
Below the piston

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

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

May open or close anywhere
Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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