Efficiency of a screw jack is given by(where α = Helix angle, and � – McqOptions

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1.	Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)
A.	tan(α + φ)/tanα
B.	tanα/tan (α + φ)
C.	tan(α - φ)/tanα
D.	None of these
Answer» C. tan(α - φ)/tanα

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