GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Seat No.: Enrolment No.
Subject Code: 2162003
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
Subject Name: Control of Electric Drives
Time: 02:30 PM TO 05:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) State the advantages and disadvantages of electric drives. | 03 |
| (b) Give classification of load torque with their characteristics. | 04 | |
| (c) Explain the four quadrant operation of electrical drive with example. | 07 | |
| Q.2 | (a) Explain how to determine the moment of inertia of drive system. | 03 |
| (b) Draw and explain basic block diagram of electric drives. | 04 | |
| (c) Derive the mathematical model of separately excited DC machine. | 07 | |
| OR | ||
| (a) Draw and explain the Dynamic V-I characteristics of SCR in detail. | 07 | |
| (b) Define the terms: (1) latching current (2) holding current (3) circuit turn-off time. | 03 | |
| (c) Explain design of snubber circuit. | 04 | |
| Q.3 | (a) Explain in brief various control strategies of a chopper. | 07 |
| OR | ||
| (a) Give the classification of Choppers. | 03 | |
| (b) Draw the circuit diagram of 1-phase half wave controlled rectifier. Also draw the waveform of output voltage with R-load with a = 60° | 04 | |
| (c) Explain A.C. phase control of TRIAC using DIAC. | 07 | |
| Q.4 | (a) Explain the field control method-for DC motor. | 03 |
| (b) Enlist methods of braking in AC motors and explain any one in detail. | 04 | |
| (c) Explain the speed control method of 3-phase induction motor. | 07 | |
| OR | ||
| (a) Explain the armature control method for DC motor. | 03 | |
| (b) Explain with necessary diagram 3-point starter using in dc motor. | 04 | |
| (c) Give the comparison between various methods of braking in dc motors. | 07 | |
| Q.5 | (a) Explain any one speed control method of 3-phase induction motor in detail. | 03 |
| (b) Explain chopper controlled DC motor drive operation for various modes. | 04 | |
| (c) Explain various PWM techniques for single phase inverter and three phase inverter. | 07 | |
| OR | ||
| (a) Enlist methods of braking in DC motors. | 03 | |
| (b) Explain in detail: Ideal dual converters. | 04 | |
| (c) Explain the construction and control of variable reluctance steeper motor in detail. | 07 |
Date: 16/11/2018
Total Marks: 70
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