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
Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation
Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy
Supercharging at high altitudes is essential

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