Internal Combustion Engines
The ratio of the brake power to the indicated power is called

Volumetric efficiency
Indicated thermal efficiency
Overall efficiency
Mechanical efficiency

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at top dead center and ends at bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
May start and end anywhere

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