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Question

The efficiency of a square threaded screw is maximum if the helix angle is equal to (where `phi` = Angle of friction)
Options:
A .  `90^circ` - `phi`
B .  `45^circ` -`phi`
C .  `45^circ` - `phi` /2
D .  `45^circ` + `phi` /2
Answer: Option C



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