Question

A double square treaded power screw has the following specification:
Major diameter, 3 in.
Pitch, 0.2 in.
Coefficient of friction for collar, 0.16
Coefficient of friction for thread, 0.12
Frictional radius of the collar, 2.5 in
Input power, 3.5 hp
Velocity of the nut, 2.5 in/s
Calculate the overall efficiency of the power screw for raising the load?
(A) 0.05
(B) 0.10
(C) 0.15
(D) 0.20​

Answer 1

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