engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Design of Machine Elements Power Screws Torque Requirement For Lifting and Lowering
In a screw jack of lead angle α, the effort required to lift the load W is given by ___________ (ϕ = Friction Angle)
1
P = W tan (α - ϕ)
2
P = W tan (α + ϕ)
3
P = W cos (α - ϕ)
4
P = W cos (α + ϕ)