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1997 Course Advanced Power Electronics

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Total No. of Questions : 10] P1410 [Total No. of Pages : 2 [3664]-29 B.E. (E & TC) ADVANCE POWER ELECTRONICS (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) Answer three questions from Section I and three questions from Section II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Assume suitable data, if necessary. SECTION - I Q1) a) What are converters? Explain with neat circuit diagram & waveforms working of 3 semi converter with resistive load. Deduce the equation for O/P voltage & O/P unit. [10] b) What is overlap angle? Explain in brief. [4] c) What is free wheeling? Explain. [4] Q2) a) What are Inverters? Explain with neat circuit diagram & waveforms working of 3 VSI with 180 made conduction with balanced R-load.[10] b) What are PWM Inverters? Explain any one type. [6] Q3) a) What are resonant converters? Explain the operation of Zero Voltage Switching (ZVS) resonant dc-dc converter with the help of equivalent diagrams & waveforms. [10] b) Compare Linear, switched mode & resonant converters. Q4) a) What is SMPS? Explain with circuit diagram. b) Explain the need of feedback diodes in Inverters. [6] [6] [4] c) What is power factor? Explain any one method of improving power factor with suitable diagram. [6] P.T.O.

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