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

Both mild and big explosions occurs simultaneously
First a big explosion followed by a mil explosion
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 compression

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

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