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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. Q3) a) What are dual converters? Explain with neat circuit diagram & waveforms working of 1 dual converter with highly inductive load. Deduce equation for circulating ic. [8] b) Does the input p.f. of converter depends on the load p.f.? Justify. [4] c) What is coasting in converters? Explain in brief. [4] OR Q4) a) What are inverters? Explain with neat circuit diagram & waveforms working of 3 transistorized voltage source inverter in 180o conduction mode feeding a balanced star load. [10] b) Justify why PWM inverters are preferred over square wave inverters?[6] Q5) a) Explain the operation of 3 transistorized VSI with 120o mode of conduction feeding balanced star load. [8] b) Explain harmonic ellimination techniques. [4] c) Compare linear, switched mode, Resonant converters. [4] OR Q6) Write short notes (any three): a) Static & Dynamic equalizing circuits. b) Braking techniques. c) Resonant converter (ZVS). d) Dual mode dual converter. e) p.f. improvement techniques. [16] SECTION - II Q7) a) b) Q8) a) b) What are dc drives? Explain with circuit diagram & W/F S, working of 1 separately excited DC Motor with highly inductive load. [10] What are DC Motor performance parameters? Explain. [6] OR What are stepper motors drives? Explain with circuit diagram & W/F S, working of stepper motor with characteristics. State its specifications & salient features. [10] What are DC servo motors? Explain. [6] [3864]-266 2 Q9) a) What are ac drives? Explain with circuit dia working of 1 speed control technique of induction motor with V technique. Comment on f Tq, speed b) Q10)a) b) Q11)a) b) [10] [6] What are braking techniques? OR What is slip power recovery? Explain static Krammer system for speed control of 3 -IM. [10] Effects of harmonics on motor drives. [6] What is the necessity of power quality? Explain with different types of powerline disturbance. [10] What is energy audit? Explain the required procedure for energy audit? [8] OR Q12)Write short notes (any three): a) Scherbius system. b) ON-line UPS. c) Flux vector control technique of IM. d) Brushless DC motors. e) Universal motors. jjj [3864]-266 3 [18]

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