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2003 Course Industrial Drives & Control

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Total No. of Questions : 11] [Total No. of Pages : 4 [3864] - 223 P 1061 B.E. (Electrical) INDUSTRIAL DRIVES AND CONTROL Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section I and three questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) What is an Electric drive? Discuss, essential parts of Electric Drive with the help block diagram. [6] Write a brief note on, speed-torque characteristics of drive operated in all four quadrants. Use the example of hoist load. [6] State the reasons for using load equalisation in Electrical Drives. Also discuss the role of Fly wheel in load equalisation method. [6] OR What is steady state stability of an electric drive? Discuss how we arrive dT L dT M >0 at the criteria for steady state stability dw dw where TL - Load torque TM - Motor torque W - Speed of the drive [8] As shown in fig 2b, for different motor-load combinations (Ex : A & B), discuss wheather drive system is unstable or stable. [4] P.T.O.

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