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Question

The maximum efficiency of a square threaded screw is


Options:
A .  `(1 - sin phi)/(1+ sin phi )`
B .  `(1+ sin phi)/(1- sin phi )`
C .  `(1 -cos phi)/(1+ cos phi )`
D .  `(1 +cos phi)/(1-cos phi )`
Answer: Option A


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