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Which fuel property resists detonation?

  • A.A high cetane number, which measures the readiness of the fuel to ignite and is therefore the relevant property
  • B.Low volatility
  • C.A high calorific value, which indicates the energy content and therefore the resistance of the fuel to detonation
  • D.A high octane rating

Answer: D

Octane rating measures resistance to spontaneous ignition under pressure. Cetane number is the diesel measure of the opposite property, ignition readiness, which makes the second option a real measure from the wrong fuel. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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