Internal Combustion Engines
Crankcase explosion in I.C. engines usually occurs as

First a big explosion followed by a mil explosion
Both mild and big explosions occurs simultaneously
Never occurs
First a mild explosion followed by a bi explosion

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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 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre

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

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

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