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2003 Course Advanced Power Electronics

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Total No. of Questions :12] P1149 [Total No. of Pages : 3 [3864] - 266 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) Draw a neat sketch 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) What are phase controlled converters? Explain with circuit diagram & W/F S, working of 3 half controlled converter feeding resistive load at =60o for following. [10] i) Supply phase voltage ii) Supply line voltage iii) O/P voltage iv) Supply current v) Current through SCR b) What is inherent freewheeling? Explain. [4] c) Why 3 converters are preferred over 1 AC-to DC converters for higher power applications? Justify. [4] OR Q2) a) Explain the effect of source inductance on performance of 1 HCC with waveforms. Derive expression for its O/P voltage, firing angle & overlap angle . [10] b) What is string efficiency ? State its significance. [4] c) Why an RLE (-) load is necessary for inversion mode? [4] P.T.O.

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