Internal Combustion Engines
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

Volumetric efficiency
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency

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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
Injecting excess fuel for raising more loads
Providing forced cooling air
Supplying compressed air to remove combustion products fully

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Internal Combustion Engines
Compression ratio of I.C. Engines is

Swept volume/cylinder volume
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Volume displaced by piston per stroke and clearance volume in cylinder
Ratio of pressure after compression and before compression

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