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Which of the following is an indicator of the combustion speed of diesel fuel and compression needed for ignition?

a) Cetane Number
b) Octane Number
c) Calorific Value
d) Pre-Ignition

Answer: a
Explanation: Octane number is the ignition quality of petrol. Calorific value is the energy contained by fuel determined by complete combustion. Pre-ignition is the premature combustion of the fuel air mixture.

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