Internal Combustion Engines
Which of the following is false statement?

Oil sludge in the engine crank case
Piston ring and cylinder wear
Detonation
Formation of hard coating on piston skirts

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Internal Combustion Engines
Supercharging is the process of

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Supplying compressed air to remove combustion products fully
Providing forced cooling air
Injecting excess fuel for raising more loads

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Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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