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
Scavenging air in diesel engine means

Air used for combustion sent under pressure
Burnt air containing products of combustion
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Forced air for cooling cylinder

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