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1997 Course Power Electronics Drives & Applications

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Total No. of Questions : 10] P1589 [Total No. of Pages : 2 [3764]-1062 B.E. (Industrial Electronics) POWER ELECTRONICS DRIVES AND APPLICATIONS (1997 Course) Time : 3 Hours] [Max. Marks :100 Instructions to 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) Use of electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Draw a neat circuit diagram of 1 semiconver drive for separately excited dc motor. Explain its operation with suitable wave forms. [10] b) Draw a neat circuit diagram of chopper fed dc drive. Explain its operation with suitable waveforms. [8] Q2) a) What are the advantages and disadvantages of 3 dc drive over 1 dc drive. [6] b) Draw a neat circuit diagram of 3 full converter dc drive. Explain its operation with suitable waveforms. [10] Q3) a) Explain the principle of Induction heating. State its application and advantages. [8] b) Q4) a) b) Explain the operation of Brushless DC motor drive. [8] Explain PF improvement using Multistep converters. [8] State advantages and disadvantages of HVDC transmission. [8] P.T.O. Q5) Write short note: [16] a) Traction Drive. b) Dielectric heating. c) DC motor performance parameters. d) PWM converter drive. SECTION - II Q6) a) What is static Kramer drive and static Scherbius drive? [6] b) What are the different speed control methods of Induction motor. Explain it in brief. [12] Q7) a) What are the various types of synchronous motors? What is self controlled mode of synchronous motor s? [4] b) Why CSI drive is preferred for synchronous motors? Explain the operation of CSI drive of a synchronous motor. [12] Q8) a) Explain the driver circuits of permanent Magnet and hybrid stepper motor. [8] b) Explain microstepping in stepper motors. [8] Q9) a) Draw the circuit diagram and explain the operation of rotor resistance control using chopper. [8] b) Explain with suitable block diagram the control of induction motor using microprocessor. [8] Q10)Write short note (any three): [16] a) VCVF drives. b) Motor drives in steel industry. c) Microprocessor based stepper motor drive. d) Start up consideration of Induction motor. Y [3764]-1062 2

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