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

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Mr. Dubey • 52.30K Points
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Q. The factional torque for square thread at the mean radius r while raising load W is given by

(A)

T = Wr \tan (φ - α)

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

(B)

T = Wr \tan (φ + α)

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

(C)

T = Wr \tan α

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

(D)

T = Wr \tan φ

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

Correct : Option (B)

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