Internal Combustion Engines
The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

Be independent
Decrease
Increase
May increase or decrease depending on other factors

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Internal Combustion Engines
Scavenging air in diesel engine means

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

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