Internal Combustion Engines
If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

Piston rings would stick into piston grooves
Engine starts overheating
Exhaust will be smoky
Scavenging occurs

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for combustion sent under pressure
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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the compression

Starts at bottom dead centre and ends at top dead centre
May start and end anywhere
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre

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