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

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere

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

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Inversely proportional to its distance from the centre
Directly proportional to its distance from the centre
Inversely proportional to its (distance)2 from the centre
Directly proportional to its (distance)2 from the centre

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