GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2172402 Date: 15/11/2018
Subject Name: Industrial Drives & Control-11
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | ||
| Q.1 | ||
| (a) | Discuss advantages of stator voltage control method for Constant load torque. | 03 |
| (b) | Explain any one application of AC Drives. | 04 |
| (c) | Explain the Operation of induction motor on unbalanced source voltage. | 07 |
| Q.2 | ||
| (a) | Enlist the application AC Drives & draw the block diagram of AC Drives. | 03 |
| (b) | Describe the analysis of Induction Motor with Unbalanced rotor impedances. | 04 |
| (c) | Draw and explain the thyristor configuration for a stator voltage controlled reversible-speed Induction Motor Drive. Also draw the speed-torque characteristics for a reversible induction motor drive. | 07 |
| OR | ||
| (c) | Analyze the Induction Motor with Non Sinusoidal source Voltages in brief. | 07 |
| Q.3 | ||
| (a) | Explain the principle behind the variation of the speed of a 3-F IM by v/f method for Operation below rated frequency. | 03 |
| (b) | Describe the limitation of sub_ synchronous speed operation in AC Drives. | 04 |
| (c) | Explain the concept of direct vector control of Induction Motor Drive. | 07 |
| OR | ||
| Q.3 | ||
| (a) | Explain the Effect of harmonics and control of harmonics on induction motor. | 03 |
| (b) | Explain the Transient analysis of Drives. | 04 |
| (c) | Discuss Principle of indirect vector control with necessary diagram. | 07 |
| Q.4 | ||
| (a) | Explain the torque slip characteristics for induction motor. | 03 |
| (b) | Explain the Principle of Vector control. | 04 |
| (c) | Explain the basic principle of DTFC for Voltage fed PWM inverter drives. | 07 |
| OR | ||
| Q.4 | ||
| (a) | Explain the concept of SRM Motor. | 03 |
| (b) | Compare CSI with VSI. | 04 |
| (c) | Discuss on Permanent Magnet AC Motor Drive. | 07 |
| Q.5 | ||
| (a) | Explain the Sensor less methods for scalar control AC motor drives. | 03 |
| (b) | Explain VSI control for IM. | 04 |
| (c) | Discuss reference frame theory for induction motor in brief. | 07 |
| OR | ||
| (a) | Explain in details of introduction to observer based Techniques in Induction Motor Drives. | 03 |
| (b) | Explain the Sinusoidal PMAC motor drives. | 04 |
| (c) | Explain block diagram of feed-forward vector control for IM. | 07 |
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