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

Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Injecting excess fuel for raising more loads
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

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at 50° before bottom dead center and closes at 15° after top dead center
May open and close anywhere
Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at bottom dead center and closes at top dead center

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