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2003 Course Advanced Power Electronics

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Total No. of Questions : 12] P1352 [Total No. of Pages : 4 [3764] - 243 B.E. (Electronics) ADVANCED POWER ELECTRONICS (2003) 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) b) Draw the circuit diagram of a three-phase fully-controlled converter feeding a highly inductive (level) active load and the following waveforms for firing angle = 120 . i) Supply phase voltages. ii) Supply line voltages. iii) Output voltage. iv) Phase B line current. [8] A three-phase fully-controlled converter operates from the 415V, 50Hz mains and feeds a highly inductive (level) active load having E = 400V and R = 20 . If the firing angle is 120 , calculate : i) Average (DC) load voltage. ii) Average (DC) load current. iii) RMS line current. iv) Power supplied by the battery of the active load. [10] v) Power fed back to the mains assuming the converter to be lossless. P.T.O.

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