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1997 Course Advanced Power Electronics

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Total No. of Questions : 10] P1623 [Total No. of Pages : 3 [3764]-1028 B.E. (E & TC) ADVANCED POWER ELECTRONICS (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) All questions carry equal marks. 6) Your answers will be valued as a whole. 7) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 8) Assume suitable data, if necessary. SECTION - I Q1) a) What are phase controlled converters? Explain with circuit diagram & waveforms working of 3 full controlled converter with RL load. Draw suitable waveforms at = 60 . [10] i) Supply volt. ii) Out put volt. iii) Supply emt. b) For 3 converter operating from a 3 415V/50Hz supply is feeding a highly induction load. The emt is continuous & ripple free equal to 100A. Find the thyrister ratings. [8] i) ITH(av). ii) ITH(rms). iii) ITH(peak). iv) PRV. P.T.O.

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