Dr. A.P.J. Abdul Kalam University MTECH III SEM (PS) Advanced Electrical Drives [MTPS302(2)] Dec 2020 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Technology

Third Semester Main Examination, Dec-2020

Advanced Electrical Drives [MTPS302(2)]

Time: 3:00 Hrs Max Marks 70

Note: Attempt any five questions. All questions carry equal marks.

Assume suitable data if necessary and state them clearly.

Q.1 (a) What are various components of load torques? Discuss the concept of load equalization.

(b) Explain Electric Breaking in detail.

Q.2 (a) Draw the Block Diagram of Close loop control of I.M. Drives.

(b) Draw and explain the operation of a closed-loop speed control scheme of dc motor drive.

Q.3 (a) Explain 1-phase fully controlled converter drive connected to separately excited D.C. motor. Derive

speed- torque relation and draw speed – torque characteristics for different firing angle.

(b) Explain three phase I.M., analysis and performance with the help of suitable

diagram.

Q.4 (a) Explain stator voltage control method of speed control of 3-phase induction motor.

(b) Describe various PWM techniques applied for the speed control of 3-phase induction motor

Q.5 (a) Explain VVVF method of speed control of 3-phase IM drives with closed loop scheme.

(b) Explain the Operation with unbalanced source voltages and single phasing of three phases Induction

Motor.

Q.6 Write shorts notes on:

 (i) Synchronous reluctance motor.

(ii) Hysteresis synchronous motor.

 (iii) Solar and battery powered drives.

(iv) Switch reluctance motor drives

Q.7 (a) Compare Single phase and three phase Induction motor drives.

(b) Draw and Explain CSI fed synchronous motor drives.

Q.8 (a) Why the slip power recovery scheme is suitable mainly for drives with a low speed range? Explain with

necessary diagram.

(b) What are various components of load torques? Discuss the concept of load equalization

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