• # 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) $W{{R}_{0}}\tan \phi$

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