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  • question_answer The frictional torque for square thread at mean radius while raising load is given by \[(W=load,\,{{R}_{0}}\,=\,\]Mean Radius,\[\phi =\]Angle of friction, \[\alpha \,=\,\]Helix angle):

    A) \[W{{R}_{0}}\tan (\phi -\alpha )\]           

    B) \[W{{R}_{0}}\tan (\phi +\alpha )\]

    C) \[W{{R}_{0}}\tan \alpha \]                    

    D) \[W{{R}_{0}}\tan \phi \]

    Correct Answer: B

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