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The maximum efficiency of a square threaded screw is

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A. (1 - sinφ)/ (1 + sinφ)

B. (1 + sinφ)/ (1 - sinφ)

C. (1 - sinφ)/ (1 + cosφ)

D. (1 + cosφ)/ (1 - sinφ)

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Correct Answer : A.


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