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Ignition quality of petrol is expressed by?

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Ignition quality of petrol is expressed by?

(a) octane number

(b) calorific value

(c) self ignition temperature

(d) cetane number

The question was asked in a job interview.

My question is from Fuels topic in section Conventional and Alternate Fuels of IC Engine

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The correct answer is (a) octane number

Easiest explanation: Ignition quality of petrol is expressed by octane number and that of diesel by cetane number.

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