Internal Combustion Engines
For the same compression ratio

Otto cycle is more efficient than the Diesel
Compression ratio has nothing to do with efficiency
Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient

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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 combustion sent under pressure
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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