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2003 Course Advanced Power Electronics

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Total No. of Questions :12] P1069 [Total No. of Pages : 4 [3864] - 243 B.E. (Electronics) ADVANCED POWER ELECTRONICS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q1 or Q2, Q3 or Q4, Q5 or Q6 from section I and Q7 or Q8, Q9 or Q10, Q11 or Q12 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) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Draw the circuit diagram of a three-phase semi-converter feeding a highly inductive (level) active load and the following waveforms for firing angle = 60o: i) ii) Supply line voltages. iii) Output voltage. iv) b) Supply phase voltages. Phase A line current. [8] A three-phase semi-converter operates from the 415V, 50Hz mains and feeds a highly inductive (level) active load having R = 20 . If the firing [10] angle is 60o, calculate: i) Average (DC) load voltage. ii) Average (DC) load current. iii) RMS line current. OR P.T.O.

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