GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Code: 2172410
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Name: Power Electronics Design
Time: 10:30 AM TO 01:00 PM
Date: 30/11/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Describe the function of PUT with suitable example circuit | 03 |
| (b) Enlist steps to design power electronics circuit. | 04 | |
| (c) Make suitable design of non-isolated driver circuit for IGBT. Support your answer with suitable diagrams. | 07 | |
| Q.2 | (a) Enlist & explain steps for transformer design at line frequency. | 03 |
| (b) Discuss the effect of poor grounding for driver circuits. | 04 | |
| (c) Discuss the design aspects and component selection for Snubber Circuit. | 07 | |
| OR | ||
| (a) Describe the methods adopted for suppressing over voltages in thyristor. | 07 | |
| (b) Enlist the requirement of isolated driver circuit. | 03 | |
| (c) Write a technical note on di/dt and dv/dt protection. | 04 | |
| Q.3 | (a) Describe the steps involving in high frequency inductor design for boost converter. | 07 |
| OR | ||
| (a) Enlist the importance of isolated driver circuit. | 03 | |
| (b) Write a technical note on Thermal protection | 04 | |
| (c) Discuss the method to design high frequency transformer for flyback converter. | 07 | |
| Q.4 | (a) Write a note on: opto-coupler. | 03 |
| (b) Draw any one isolated driver circuit for TRIAC. | 04 | |
| (c) Discuss a method to measure analog quantity like voltage, current & frequency. | 07 | |
| OR | ||
| (a) Discuss working of pulse transformer in brief. | 03 | |
| (b) Write a brief note on floating ground concept. | 04 | |
| (c) Design non-isolated type driver circuit for Power BJT. Support your answer with suitable diagrams. | 07 | |
| Q.5 | (a) Explain the Natural Cooling & forced Cooling of Heat Sinks. | 03 |
| (b) Enlist & explain types of PCBs. | 04 | |
| (c) Write a short note on design Considerations for Voltage Isolation and Current Capacity for PCB design. | 07 | |
| OR | ||
| (a) Write a detailed note on Thermal Resistance & its Consideration | 03 | |
| (b) Explain the Noise Reduction Through PCB Layout. | 04 | |
| (c) Write a brief note on PCB designing. | 07 |
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