The factional torque for square thread at the mean radius r while raising load W is given by Options: A . &nbsp$${\text{T}} = {\text{Wr}}\tan \left( {\varphi - \alpha } \right)$$ B . &nbsp$${\text{T}} = {\text{Wr}}\tan \left( {\varphi + \alpha } \right)$$ C . &nbsp$${\text{T}} = {\text{Wr}}\tan \alpha $$ D . &nbsp$${\text{T}} = {\text{Wr}}\tan \varphi $$

The factional torque for square thread at the mean radius r while raising load W

Question

The factional torque for square thread at the mean radius r while raising load W is given by

Options:

A . $${\text{T}} = {\text{Wr}}\tan \left( {\varphi - \alpha } \right)$$

B . $${\text{T}} = {\text{Wr}}\tan \left( {\varphi + \alpha } \right)$$

C . $${\text{T}} = {\text{Wr}}\tan \alpha $$

D . $${\text{T}} = {\text{Wr}}\tan \varphi $$

Answer: Option B

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