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Octane number measures a fuel's resistance to

  • A.vaporisation at low temperature
  • B.knocking in a spark ignition engine
  • C.autoignition in a compression ignition engine
  • D.oxidation in storage

Answer: B

A higher octane fuel resists premature ignition and allows a higher compression ratio. Cetane number is the corresponding property for diesel and runs in the opposite direction. Higher octane permits a higher compression ratio.

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