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

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

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Internal Combustion Engines
In a typical medium speed, 4-stroke cycle diesel engine

Fuel injection starts at just before top dead center and ends just after top dead center
Fuel injection starts at top dead center and ends at 20° after top dead center
May start and end anywhere
Fuel injection starts at 10° before top dead center and ends at 20° after top dead center

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