Internal Combustion Engines
For the same compression ratio

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

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Internal Combustion Engines
Scavenging air in diesel engine means

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

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