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  1. Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

    2. A.
    μ > tan α
    B.
    μ ≥ tan α
    C.
    μ > tan 2α
    D.
    μ ≤ tan α

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    Answer : Option B

    Explanation :

    No answer description available for this question.

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