Internal Combustion Engines
The knocking in diesel engines may be prevented by

Raising the compression ratio
Reducing the delay period
Increasing the inlet pressure of air
All of these

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Internal Combustion Engines
Compression ratio of I.C. Engines is

The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Volume displaced by piston per stroke and clearance volume in cylinder
Swept volume/cylinder volume
Ratio of pressure after compression and before compression

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