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

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1.	The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where ≈ì√ú = Angle of friction)#
A.	90¬¨‚àû - ≈ì√ú
B.	45¬¨‚àû - ≈ì√ú
C.	45¬¨‚àû - ≈ì√ú/2
D.	45¬¨‚àû + ≈ì√ú/2
Answer» D. 45¬¨‚àû + ≈ì√ú/2

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