GTU BE 2019 Summer Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION — SUMMER 2019
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Subject Code:2172402 Date:10/05/2019
Subject Name:Industrial Drives & Control-II
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Compare CSI with VSI giving three points. | 03 |
| (b) Explain CSI control for Induction Motor. | 04 | |
| (c) Describe the analysis of Induction Motor with (1) Unbalanced rotor impedances & (2) Non-sinusoidal voltage supply. | 07 | |
| Q.2 | (a) Explain induction motor drive fed from VSI. | 03 |
| (b) Discuss drawback of IM Drive fed from a stepped wave Inverter. | 04 | |
| (c) What are the similarities between a brushless dc motor and a conventional dc motor? Why it is known as a brushless dc motor? Enlist its advantages over a conventional dc motor. | 07 | |
| OR | ||
| Q.3 | (a) Discuss trapezoidal PMAC motor drive for servo application. | 07 |
| (b) Discuss advantages of stator voltage control method for constant load-torque. | 03 | |
| (c) Discuss advantages of stator voltage control method for Fan type loads. | 04 | |
| (d) Discuss IM’s behavior for non-sinusoidal source voltages. | 07 | |
| OR | ||
| Q.4 | (a) Draw block diagram of a dc link converter for multi-motor ac drive. | 03 |
| (b) Explain the derivation of stator reference frame model. | 04 | |
| (c) Explain the principle behind the variation of the speed of a 3-F IM by v/f method. Discuss this for the operation below and above rated frequency. | 07 | |
| Q.5 | (a) Draw the circuit for self-controlled synchronous motor drive using load commutated thyristor-based inverter. | 04 |
| (b) Discuss reference frame theory for induction motor in brief. | 07 | |
| (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. | 03 | |
| OR | ||
| Q.5 | (a) Draw the block diagram of feed-forward vector control for IM. | 04 |
| (b) Explain the basic principle of DTFC for Voltage fed PWM inverter drives. | 07 | |
| (c) Explain variable-frequency operation of Induction Motor. Also draw torque characteristics for this motor at constant volts / Hz. | 03 | |
| (d) Discuss on sensitivity of vector-controlled Induction Motor | 04 | |
| (e) Discuss on compensation of vector-controlled Induction Motor | 07 | |
| (f) Explain the concept of direct vector control of Induction Motor Drive. | 03 | |
| OR | ||
| (a) Brief the idea about speed control of synchronous motor by vector control method. | 04 | |
| (b) Discuss dynamic d-q model of Induction Motor. | 07 | |
| (c) Discuss Principle of indirect vector control with necessary diagram. | ||
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