Answered: 1. A double square thread power screw…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1. A double square thread power screw has a pitch of 6 mm and mean radius of
34 mm. If it is used to lift a load 50 kN and coefficient of friction of threads is 0.15, determine the torque required to
turn the screw.
A. 343.74 N-m B. 353.47 N-m C. 335.47 N-m D. 347.35 N-m
2. A lubricated bolt needs an initial torque of 145 lb-ft to take the initial tension brought by the compressor without
breaking. Determine the initial torque needed by the bolt if the bolt was not lubricated.
A. 107.85 lb-ft B.108.25 lb-ft C. 108.75 lb-ft D. 193.33 lb-ft

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