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2003 Course Advanced Power Electronics

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Total No. of Questions : 12] P988 [Total No. of Pages : 4 [3664]-199 B.E. (E&TC) ADVANCED POWER ELECTRONICS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6 from Section - I and Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.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) 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) Explain the effect of source inductance on the performance of a single phase full converter with waveforms. [10] Derive expression for its output voltage interms of maximum voltage (vm), firing angle , & overlap angle . Explain how two 3- full converters can be connected back to back to form a circulating current type of dual converter. Explain its operation with the help of voltage waveform across 1) Each converter. 2) Load. 3) Reactor. [8] OR Q2) a) b) Draw the circuit diagram of 3- fully controlled converter operating with highly inductive load & explain operation with following waveforms for = 60 . i) Load voltage. ii) Load current. iii) Supply current (any one phase). iv) Current though SCR (any one). [12] Define string efficiency and state its significance in connection with series and parallel operation of power devices. [6] P.T.O.

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