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1997 Course Power Electronics - III

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Total No. of Questions : 10] P1841 [Total No. of Pages : 2 [3764]-1052 B.E. (Electronics) POWER ELECTRONICS - III (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 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) Use of logarithmic tables & non- programmable electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) With the help of a neat circuit diagram and waveforms, explain the operation of single phase separately excited DC motor drive using full converter. Derive the expression for average output voltage. Mention important features of the system. [16] Q2) With the help of neat circuit diagram and waveforms, explain the operation of three phase semiconverter driven separately excited DC motor drive. [16] Q3) Explain ideal dual converter. What is the difference between ideal and non-ideal dual converters? What is circulating current? [16] Q4) What is braking of a DC motor? Mention various braking techniques. Explain any one in details. [16] P.T.O. Q5) Write notes on (any three) [18] a) Traction drive. b) Dual mode dual converter. c) Reversible drive. d) Performance parameters for DC drive. SECTION - II Q6) Explain various speed control techniques for induction motor. [16] Q7) With the help of neat diagram and waveforms explain the operation of a stepper motor drive. [16] Q8) What are resonant converters? Explain the operation of series resonant converter. [16] Q9) a) Explain various protection circuits used for AC motors. b) Explain vector control induction motor drive. Q10) Write notes on (any two): [8] [18] a) Synchronous motor drive. b) Digital control of DC motor. c) Class E resonant inverter. d) Microstepping in stepper motors. rrr [3764]-1052 [8] -2-

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