Maximum efficiency of a screw jack for the angle of friction θ, is – McqOptions

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1.	Maximum efficiency of a screw jack for the angle of friction θ, is
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» E.

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