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2003 Course Industrial Drives & Control

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Total No. of Questions : 11] P940 [Total No. of Pages : 4 [3664]-180 B.E. (Electrical) INDUSTRIAL DRIVES AND CONTROL (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate answer 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. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Explain speed torque conventions and multiquadrant operation of drives. [8] b) A drive has following parameters : J = 1 kg - m2, T = 15 - 0.01 N, N-m and passive load torque, Te = 0.005 N, N-m, where N is the speed in rpm. Initially the drive is operating in steady - state. Now it is to be reversed. For this, motor characteristic is altered such that T = 15-0.01N. N-m for positive as well as negative values of N. Calculate the reversal time. [8] OR Q2) a) State essential parts of electric drives and function of each parts. [8] b) A weight of 500 kg is being lifted up at a uniform speed of 1.5 m/s by a winch driven by motor running at speed of 1000 rpm. The moments of inertia of the motor and winch are 0.5 and 0.3 kg-m2 respectively. Calculate the motor torque and the equivalent moment of inertia referred to the motor shaft. In the absence of weight motor develops a torque of 100 N-m when running at 1000 rpm. [8] Q3) a) What do you mean by braking while lowering the load? What is the objective of such braking. [8] P.T.O.

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