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

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Internal Combustion Engines
Scavenging air in diesel engine means

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

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° after top dead center and ends at 30° before bottom dead center
May start and end anywhere
Starts at top dead center and ends at 30° after top dead center
Starts at 15° before top dead center and ends at 30° after top dead center

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