GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2160902
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Power Electronics — II
Time: 10:30 AM TO 01:00 PM
Date: 16/05/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.No | Question | Marks |
|---|---|---|
| Q.1 (a) | Draw circuit and waveforms for half bridge inverter. | 03 |
| Q.1 (b) | Write a note on sinusoidal pulse width modulation. | 04 |
| Q.1 (c) | Explain principle of operation of current source inverter. | 07 |
| OR | ||
| Q.1 (a) | Explain the role of feedback diodes in inverter circuit. | 03 |
| Q.1 (b) | Give 8 points of comparison between square wave inverter and bipolar PWM inverter. | 04 |
| Q.1 (c) | Explain working of 3 phase bridge inverter with star connected resistive load with 180° mode using gate signals, output phase voltage and line voltage. | 07 |
| Q.2 | ||
| OR | ||
| Q.2 | Explain working of 3 phase bridge inverter with star connected resistive load with 120° mode using gate signals, output phase voltage and line voltage. | 07 |
| Q.2 (a) | Enlist limitations of basic series inverter. Draw modified series inverter which overcomes listed limitations. | 03 |
| Q.2 (b) | Give four points of difference between on-off control and phase angle control. | 04 |
| Q.2 (c) | Explain working 1-f transformer tap changer with ac voltage controller circuit. | 07 |
| Q.3 | ||
| OR | ||
| Q.3 (a) | Explain how to vary output voltage of PWM inverter | 03 |
| Q.3 (b) | Draw the circuit and explain working of bridge type 1-f cycloconverter with resistive load showing waveforms for output frequency ?rd of input frequency. | 04 |
| Q.3 (c) | Write a note on matrix converter. | 07 |
| Q.4 (a) | Draw schematic diagram of induction motor speed control system using current source inverter. | 03 |
| Q.4 (b) | Explain operating modes of induction motor. | 04 |
| Q.4 (c) | What is slip power? Explain Kramer static system for the control of a three phase induction motor. | 07 |
| Q.4 | ||
| OR | ||
| Q.4 (a) | Explain effects of harmonics in induction motor drives. | 03 |
| Q.4 (b) | Give four points of difference between V/f control and Slip power recovery method of speed control of induction motor. | 04 |
| Q.4 (c) | Write a note on voltage source inverter fed synchronous motor drive. | 07 |
| Q.5 (a) | State various applications which use ac electrical drives. | 03 |
| Q.5 (b) | Write a note on ac voltage controllers with PWM control. | 04 |
| Q.5 (c) | Write a note on three phase to single phase cycloconverter with inter group reactor. | 07 |
| Q.5 | ||
| OR | ||
| Q.5 (a) | Explain the principle of on-off control for ac voltage controllers. | 03 |
| Q.5 (b) | Explain working of mid - point cycloconverter with circuit diagram and waveform. | 07 |
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