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

Indicated thermal efficiency
Mechanical efficiency
Overall efficiency
Volumetric efficiency

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

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
Swept volume/cylinder volume
Ratio of pressure after compression and before compression

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