Internal Combustion Engines
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

75% normal heptane and 25% iso-octane
75% iso-octane and 25% normal heptane
75% petrol and 25% diesel
75% diesel and 25% petrol

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Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The friction is high
The engine is rarely operated
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect

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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
Forced air for cooling cylinder
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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