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Anna University Question Paper Code 71639
M.E. DEGREE EXAMINATION, JUNE/JULY 2013.
Elective
Power Electronics and Drives
PE 9252/PE 9351/10233 PEE 13/PE 952
ADVANCED POWER SEMICONDUCTOR DEVICES
(Common to M.E. Electrical Drives and Embedded Control)
(Regulation 2009/2010)
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PART A — (10 x 2 = 20 marks)
1. What is meant by SOA?
2. What are the various types of power diode?
3. Why vertical structure type construction is preferred for power transistors?
4. What are the problems associated with series connected SCRs?
5. What type of power MOSFET preferred for practical use?
6. How to turn-on and turn-off the IGCT?
7. What is the need for isolation in power electronics circuits?
8. What are the different types of Snubber?
9. What are the heat transfer modes?
10. What are the different types of heat sink?
PART B — (5 x 16 = 80 marks)
11. (a) Explain the characteristics and specifications of an ideal power semiconductor switch. (16)
Or
(b) (i) Write short notes on EMI due to switching. (8)
(ii) Discuss the reverse recovery characteristics of power diode. (8)
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