Internal Combustion Engines
The increase of efficiency of a compression ignition engine, as the load decreases, is due to

Higher maximum temperature
Quantitative governing
Qualitative governing
Hit and miss governing

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Internal Combustion Engines
For the same compression ratio

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

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