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1997 Course Advanced Power Electronics

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Total No. of Questions : 10] P1623 [Total No. of Pages : 3 [3764]-1028 B.E. (E & TC) ADVANCED POWER ELECTRONICS (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer 3 questions from Section I and 3 questions 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) All questions carry equal marks. 6) Your answers will be valued as a whole. 7) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 8) Assume suitable data, if necessary. SECTION - I Q1) a) What are phase controlled converters? Explain with circuit diagram & waveforms working of 3 full controlled converter with RL load. Draw suitable waveforms at = 60 . [10] i) Supply volt. ii) Out put volt. iii) Supply emt. b) For 3 converter operating from a 3 415V/50Hz supply is feeding a highly induction load. The emt is continuous & ripple free equal to 100A. Find the thyrister ratings. [8] i) ITH(av). ii) ITH(rms). iii) ITH(peak). iv) PRV. P.T.O. Q2) a) What are inverters? Explain with ckt dia. & waveforms working of 3 VSI in 180 conduction mode with R load. [10] b) Compare VSI & CSI. [6] Q3) a) What are Resonant converters? Explain with ckt diagram & w/fs working of ZVS. [10] b) Compare linear, switched mode & resonant converters. [6] Q4) a) What is switched mode power supply? Compare with linear regulated power supplies. [8] b) Effect of EMI/EMC for SMPS. Q5) Write short notes on any three : [8] [16] a) Current source Inverters. b) 3 ASCSI with I.M. c) Harmonic Elimination techniques in inverter. d) Dual converters. e) P.F. Improvement techniques. SECTION - II Q6) a) What are dc drives? Explain with ckt dia. & waveform working of 1 semi converter controlled highly inductive load. Comment on Tq & Speed. [8] b) What is dynamic braking? Explain in brief. [4] c) Effect of Ls over converter. [4] Q7) a) What are UPS? How it is different from AC regulators? Explain with block diagram & waveforms working of off-line UPS. State its specifications. [10] b) Compare ONLINE - ups, line interactive UPS & off line - UPS. [3764]-1028 -2- [6] Q 8) a) What are choppers? Justify why choppers are preferred over phase controlled converters for speed control of DC Motors? [8] b) What is stepdown chopper? Explain with ckt diagram & waveforms.[8] Q9) a) What are AC drives? Explain with block diagram working, speed control of 1 I.M. by using V/f techniques. [8] b) What are Stepper Motors? Explain with principle, working of PM Stepper Motor drive. [8] Q10) Write short notes on any three: [18] a) BLDC. b) Flux Vector Techniques. c) based Stepper Motor Control. d) DC Current sensing & speed measurement techniques. e) 4Q-choppers. rrrr [3764]-1028 -3-

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