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

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

1.	The efficiency of a square threaded screw is maximum if the helix angle is equal to (where φ = Angle of friction)
A.	90° - φ
B.	45° - φ
C.	45° - φ/2
D.	45° + φ/2
Answer» D. 45° + φ/2

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

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