(c) A preliminary design of screw operated lifting machine is shown in Figure Q2(c) has below specifications as tabulated in Table Q2(c). (i) Compare which screw has greater Mechanical Advantages. Prove your answer. (ii) From your answer at (i), find the minimum effort force to lift the crate and also calculate the required torque of the electric motor. (iii) Suggest the motor power if screw is rotating at 30 RPM. (iv) Calculate the work done if crate has been lifted 100 mm vertically. (v) As to continuously improve the system performance, suggest a method that could enhance the system operation. Table Q2(c) Descriptions Screw diameter Screw B 50 mm 8 mm x kg Screw A 24 mm Screw Pitch, p Crate Mass, kg Coefficient between thread and Screw Housing, u. 8 mm x kg of Friction 0.3 0.3 X=018kg -Electric Motor Crate Figure Q2(e)

(c) A preliminary design of screw operated lifting machine is shown in Figure Q2(c) has below specifications as tabulated in Table Q2(c). (i) Compare which screw has greater Mechanical Advantages. Prove your answer. (ii) From your answer at (i), find the minimum effort force to lift the crate and also calculate the required torque of the electric motor. (iii) Suggest the motor power if screw is rotating at 30 RPM. (iv) Calculate the work done if crate has been lifted 100 mm vertically. (v) As to continuously improve the system performance, suggest a method that could enhance the system operation. Table Q2(c) Descriptions Screw diameter Screw B 50 mm 8 mm x kg Screw A 24 mm Screw Pitch, p Crate Mass, kg Coefficient between thread and Screw Housing, u. 8 mm x kg of Friction 0.3 0.3 X=018kg -Electric Motor Crate Figure Q2(e)

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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