For a power screw having square threads with lead angle of 45° and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by

For a power screw having square threads with lead angle of 45° and co

1.	For a power screw having square threads with lead angle of 45° and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by
A.	74%
B.	64%
C.	54%
D.	44%
Answer» B. 64%

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For a power screw having square threads with lead angle of 45° and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by

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