The efficiency of a square threaded screw is maximum if the helix angle is equal

Question - The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

Options:

A . 90° - φ

B . 45° - φ

C . 45° - φ/2

D . 45° + φ/2

Answer: Option C

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