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

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at top dead center and ends at bottom dead center

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Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

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

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