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
Scavenging air in diesel engine means

Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Air used for combustion sent under pressure
Burnt air containing products of combustion
Forced air for cooling cylinder

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