GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Name: Industrial Drives and Control
Time: 10:30 AM TO 01:00 PM
Subject Code: 2171707
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018Subject Name: Industrial Drives and Control
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | List out different selection criteria for the electrical drive. | 03 |
| (b) | List Advantages & Disadvantages of DC Drive. | 04 | |
| (c) | Discuss in brief, Phase Locked Loop (PLL) control of the dc motor drive using block diagram. | 07 | |
| Q.2 | (a) | Draw the detailed block diagram indicating all parts of Electrical motor drive. | 03 |
| (b) | How to measure motor constants? Explain it in detail. | 04 | |
| (c) | Explain state space modeling of DC motor drive with block diagram. | 07 | |
| OR | |||
| (c) | List the performance parameters of the dc drives. Define each of them. | 07 | |
| Q.3 | (a) | Draw the waveforms of 1st quadrant chopper operation for DC motor drive. | 03 |
| (b) | Discuss types of Duty cycle for motor operation. | 04 | |
| (c) | Explain constant Volts/Hz control for induction motor drive. | 07 | |
| OR | |||
| (a) | Explain the working principle of ideal dual converter. | 03 | |
| (b) | Write brief note on permanent magnet motor drive. | 04 | |
| (c) | Explain Dynamic and Composite-braking of separately excited dc motor with chopper control. | 07 | |
| Q.4 | (a) | Discuss merits and demerit of multi-phase chopper circuit. | 03 |
| (b) | Write a Technical Note on:'Servo Motor DC Drive. | 04 | |
| (c) | Write a brief note on selection of motor power rating with illustration. | 07 | |
| OR | |||
| (a) | Discuss the effect of free wheeling diode on converter operation. | 03 | |
| (b) | Explain Current Limit control and Closed loop speed Control. | 04 | |
| (c) | Derive an expression for average output voltage of boost chopper circuit. | 07 | |
| Q.5 | (a) | Explain unipolar drive circuit for stepper motor. | 03 |
| (b) | Explain drive circuit for stepper motor. | 04 | |
| (c) | Explain Traction drive employing two stage converter feeding four separately excited motors. | 07 | |
| OR | |||
| (a) | Draw and explain torque versus stepping rate characteristic of stepper motors. | 03 | |
| (b) | Explain operation of brushless DC motor. | 04 | |
| (c) | Explain closed loop speed control scheme for control of below and above base speed | 07 |
Date: 15/11/2018
Total Marks: 70
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