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1997 Course Advanced Power Electronics

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Total No. of Questions : 10] P1359 [Total No. of Pages : 3 [3864]-30 B.E. (E & TC) ADVANCE POWER ELECTRONICS (1997 Course) (404185) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 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) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) Q3) a) b) c) What are phase controlled converters? Explain with circuit diagram & W/F S, working of 3 semiconverter with R-load. Deduce the equation for o/p voltage. [10] Justify why p.f is poor in FCC compared to HCC. [3] What is the effect of Ls on converter o/p? Explain. [3] What are inverters? Explain with circuit diagram & W/F S working of 3 VSI with 180 conduction mode feeding star connected resistive load. [10] Why PWM inverters are preferred over sq.wave & quass-sq.wave inverters? Justify. [6] What are resonant converters? Explain with circuit diagram & W/F S working of ZVS resonant converter. [8] Compare linear, switched mode & resonant converters. [4] What is SMPS? Explain in brief. [4] P.T.O.

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