Discussion
Cetane number measures a diesel fuel's
Answer: B
Correct answer: ease of ignition under compression
A diesel has no spark, so the fuel must ignite of its own accord when injected into the hot compressed air, and cetane number measures how readily it does - the delay between injection and ignition. It is the opposite requirement to petrol, where the fuel must resist spontaneous ignition, which is why a high octane fuel is generally a poor diesel and the reverse.
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