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The measure of knock characteristics of a fuel is known as ______

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The measure of knock characteristics of a fuel is known as ______

(a) Cetane number

(b) Octane number

(c) Calorific value

(d) Volatility

I have been asked this question in final exam.

This is a very interesting question from Fuel Supply System in portion Fuel Supply and Cooling System of Farm Machinery

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The correct choice is (b) Octane number

The explanation is: The percentage of iso-octane (C8H18) in the reference fuel consisting of a mixture of iso-octane and normal heptane (C7H16), when produces the same knocking effect as the fuel under test, is called Octane number of the fuel.

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