Internal Combustion Engines
The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Volumetric efficiency
Relative efficiency
Overall efficiency
Mechanical 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
Ratio of pressure after compression and before compression
Volume displaced by piston per stroke and clearance volume in cylinder
Swept volume/cylinder volume

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