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

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Ensure that penetration is not high
Inject fuel at a high velocity to facilitate atomization
Inject fuel in a chamber of high pressure at the end of compression stroke
All of these

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