GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Code: 2132404 Date: 14/12/2018
Subject Name: Principles of Power Electronics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (New) EXAMINATION — WINTER 2018Subject Code: 2132404 Date: 14/12/2018
Subject Name: Principles of Power Electronics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| MARKS | |
|---|---|
| Q.1 (a) List out various applications of Power Electronics. | 03 |
| (b) Explain Interdisciplinary Nature of Power Electronics. | 04 |
| (c) Draw block diagram of “Power Electronics system” and explain each block in detail. | 07 |
| Q.2 (a) Write short notes on Zener Diode. | 03 |
| (b) Explain construction and characteristics of Tunnel Diode. | 04 |
| (c) Give the comparison of ideal and practical switch with necessary waveform. | 07 |
| OR | |
| (c) Explain the concept of Safe Operating Area. | 07 |
| Q.3 (a) Explain about the Fast Recovery Diode. | 03 |
| (b) Explain the structure of Power Diode. | 04 |
| (c) Draw and explain input and output characteristics of NPN transistor in CE configurations. | 07 |
| OR | |
| Q.3 (a) Differentiate between signal and power BJT. | 03 |
| (b) Explain DC and AC load line concept for BJT. | 04 |
| (c) Explain static V-I characteristics of SCR. | 07 |
| Q.4 (a) Explain various Turn-on methods of SCR. | 03 |
| (b) Explain construction, characteristics and applications of DIAC. | 04 |
| (c) Explain class-A commutation of Thyristor. | 07 |
| OR | |
| Q.4 (a) Explain only concept of LASCR. | 03 |
| (b) Write short note on TRIAC. | 04 |
| (c) Explain class-B commutation of Thyristor. | 07 |
| Q.5 (a) List out various applications of MOSFET. | 03 |
| (b) Explain the two-transistor analogy of SCR | 04 |
| (c) Explain construction and working principle of Power MOSFET. | 07 |
| OR | |
| Q.5 (a) Give the comparison between BJT and MOSFET. | 03 |
| (b) Explain the GTO in detail. | 04 |
| (c) Explain the concept of Soft and Hard Switching of Power Electronics switch. | 07 |
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