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