Internal Combustion Engines
For the same compression ratio

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

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Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at top dead center and ends at bottom dead center

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