Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel in a chamber of high pressure at the end of compression stroke
All of these
Ensure that penetration is not high
Inject fuel at a high velocity to facilitate atomization

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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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