Theory of machines - Engineering

Q1:

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

A T = W.r tan(φ - α)

B T = W.r tan(φ + α)

C T = W.r tan α

D T = W.r tan φ

ANS:B - T = W.r tan(φ + α)

Explanation: No answer description is available.