Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging at high altitudes is essential
Supercharging reduces knocking in diesel engines
There can be limited supercharging in petrol engines because of detonation
Supercharging results in fuel economy

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Internal Combustion Engines
For the same compression ratio

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

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