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):

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

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

The frictional torque for square thread at mean radius while raising l

1.	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.	\[W{{R}_{0}}\tan \phi \]
Answer» C. \[W{{R}_{0}}\tan \alpha \]

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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):

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