In a screw jack, the effort required to lift the load is given by (wh – McqOptions

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1.	In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
A.	P = W tan (α - φ)
B.	P = W tan (α + φ)
C.	P = W tan (φ - α)
D.	P = W cos (α + φ)
Answer» C. P = W tan (φ - α)

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