Internal Combustion Engines
If petrol is used in a diesel engine, then

Efficiency will be low
Black smoke will be produced
Higher knocking will occur
Low power will be produced

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

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

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