I need expert handwritten solutions to this question, don't use Artificial intelligence QUESTION 3 (20 marks)6mksa For a Screw Jack, state the mathematical expressions to determine the following parameters:(iii) Maximum Efficiency(i) Helix Angle (ii) Torque to lift loadb) An electric motor driven power screw moves a nut in a horizontal plane against a force of 75 kN at aspeed of 300mm/min. The screw has a single square thread of 6 mm pitch on a major diameter of 40Smksmm. The coefficient of friction at the screw threads is 0.1. Estimate power of the motor.c) The pitch of 50 mm mean diameter threaded screw of a screw jack is 12.5 mm. The coefficient offriction between the screw and the nut is 0.13. Determine the torque required on the screw to raise aload of 25 kN, assuming the load to rotate with the screw. determine the ratio of the torque required toraise the load to the torque required to lower the load and also the efficiency of the machine. 7mks

Answered: QUESTION 3 (20 marks) 6mks a For a…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter9: Components For Electric Motors

Section: Chapter Questions

Problem 18RQ

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Pull-out torque of a SCIM occurs at that value of slip where rotor power factor equals a) unity b) 0.707 c) 0.866 d) 0.5
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