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The percentage of iso-octane in a mixture of iso-octane and n-heptane is called

Question and options

The percentage of iso-octane in a mixture of iso-octane and n-heptane is called
  1. Cetane number
  2. Knocking number
  3. Anti-knocking number
  4. Octane number

Answer and explanation

Correct answer: D - Octane number
Octane number is the percentage by volume of iso-octane (rated 100) in an iso-octane/n-heptane (rated 0) blend that matches the fuel's knocking.

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