Multiple choice

Which of the following is regarded as a standard measure of the anti-knock properties of the fuel?

  1. Cetane number

  2. Cetane index

  3. Isocetane

  4. Octane number
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D Correct answer
Explanation

Octane rating or octane number is a standard measure of the anti-knock properties (i.e. the performance) of a motor or aviation fuel. The higher the octane number, the lesser likely is the fuel to ignite prematurely in the engine's cycle and cause the engine damage. In broad terms, fuels with a higher octane rating are more suitable for high-performance engines.

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