Internal Combustion Engines
Scavenging air in diesel engine means

Forced air for cooling cylinder
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Burnt air containing products of combustion
Air used for combustion sent under pressure

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

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