If α denotes the lead angle and φ, the angle of friction, then the – McqOptions

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1.	If α denotes the lead angle and φ, the angle of friction, then the efficiency of the screw is written as
A.	tan(α − φ)/tanα
B.	tanα/tan (α − φ)
C.	tan(α + φ)/tanα
D.	tanα/tan (α + φ)
Answer» E.

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