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2003 Course Industrial Drives & Control

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Total No. of Questions : 11] P1339 [Total No. of Pages : 3 [3764] - 203 B.E. (Electrical) INDUSTRIAL DRIVES & CONTROL (2003 Course) 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) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. SECTION - I Q1) a) b) State essential parts of electrical drives state functions of different parts. [8] What is drive? Explain different types of drives and procedure for selection [8] it. OR Q2) a) b) Q3) a) b) Explain speed torque conventions and multiquadrant operation of drive. [8] A motor is used to drive a hoist. Motor characteristics are given by Quadrant I & II T = 200-0.2N N-m Quadrant III & IV T = -200-0.2N N-m Where N is speed in rpm, when hoist is loaded the net load torque Tl = 100 N-m and when it is unloaded net load torque is Tl = -80 N-m. Obtain the equilibrium speeds for operations in all quadrants. [8] Why braking is required for an electrical drive. What are advantages of electric braking. [8] A 230V 960 rpm and 200A d.c. separately excited motor has an armature resistance of 0.02 W . Motor is required to hold the rated load torque by dynamic braking at 1200rpm without emf exceeding 230V. Calculate the value of external resistance to be added with armature. [8] P.T.O.

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