Internal Combustion Engines
Diesel fuel, compared to petrol is

Highly ignitable
More difficult to ignite
Less difficult to ignite
Just about the same difficult to ignite

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

Swept volume/cylinder volume
Ratio of pressure after compression and before compression
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

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