## 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

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