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  1. The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)

    2. A.

    α = 45° + φ/2
    B.

    α = 45° - φ/2
    C.

    α = 90° + φ
    D.

    α = 90° - φ

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    Workspace

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    Answer : Option B

    Explanation :

    No answer description available for this question.

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