Internal Combustion Engines
A fuel of cetane number 40 has the same ignition quality as a mixture of

40% diesel and 60% petrol
40% cetane and 60% alpha methyl naphthalene
40% alpha methyl naphthalene and 60% cetane
40% petrol and 60% diesel

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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
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

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