Efficiency of a screw jack is given by

1.	Efficiency of a screw jack is given by
A.	tan (α + φ)/tanα
B.	tanα/tan (α +φ)
C.	tan (α - φ)/tanα
D.	tanα/tan (α - φ)
Answer» C. tan (α - φ)/tanα

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Efficiency of a screw jack is given by

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