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  1. Which of the following fuel has little tendency towards detonation?

    2. A.

     Benzene
    B.

     Iso-octane
    C.

     Normal heptane
    D.

     Alcohol

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    Answer : Option B

    Explanation :

    Iso-octane has little tendency towards detonation. gasoline with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90. Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane numbers higher than 100.

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