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Question
Maximum efficiency of a screw jack for the angle of friction θ, is
Options:
A .  sin θ/(1 + sin θ)
B .  (1 - sin θ)/sin θ
C .  (1 + sin θ)/(1 - sin θ)
D .  (1 - sin θ)/(1 + sin θ)
Answer: Option D
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