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

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

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Internal Combustion Engines
Scavenging air in diesel engine means

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

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
All of these
Relative velocity between the fuel injection and air turbulence pressure of residual gases

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