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

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

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

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