The maximum efficiency of a square threaded screw is

1.	The maximum efficiency of a square threaded screw is
A.	(1 - sinφ)/ (1 + sinφ)
B.	(1 + sinφ)/ (1 - sinφ)
C.	(1 - sinφ)/ (1 + cosφ)
D.	(1 + cosφ)/ (1 - sinφ)
Answer» B. (1 + sinφ)/ (1 - sinφ)

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The maximum efficiency of a square threaded screw is

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