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2003 Course Advanced Power Electronics

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Total No. of Questions : 12] P996 [Total No. of Pages : 4 [3664]-213 B.E. (Electronics) ADVANCED POWER ELECTRONICS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer Q. No. 1 or Q. No. 2, Q. No. 3 or Q. No. 4, Q. No. 5 or Q. No. 6 from Section - I and Q. No. 7 or Q. No. 8, Q. No. 9 or Q. No. 10, Q. No. 11 or Q. No. 12 from Section - II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Draw the diagram of 3-phase fully controlled converter operating with a highly inductive load and explain operation with following waveforms for = 60 . [10] i) Load voltage. ii) Load current. iii) Current through SCR. (any one) b) Discuss the effect of source inductance on the performance of a single phase full converter indicating clearly the conduction of various thyristors during one cycle derive expressions for output voltage interms of [8] i) Maximum Voltage (Vm). ii) Firing angle ( ). & iii) Overlap angle . OR Q2) a) Explain how two 3- full converter can be connected back to back to form a circulating current type of dual converter. [10] i) Discuss its operation with the help of voltage waveforms across (1) each converter (2) load (3) reactor. P.T.O.

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