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The frictional torque for square thread at mean radius while raising load is given be (W=load, R0 = Mean radius, f = Angle of friction, a = Helix angle)       

         (a) WR0 tan ($\phi$– $\alpha$)         (b) WR0tan($\phi$+ $\alpha$)

         (c) WR0 tan $\alpha$                 (d) WR0 tan $\phi$

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