Internal Combustion Engines
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

75% diesel and 25% petrol
75% iso-octane and 25% normal heptane
75% normal heptane and 25% iso-octane
75% petrol and 25% diesel

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Internal Combustion Engines
For the same compression ratio

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

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

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