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1997 Course Power Electronics Drives & Applications

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Total No. of Questions : 10] P1148 [Total No. of Pages : 2 [3664]-58 B.E. (Industrial Electronics) POWER ELECTRONICS DRIVES AND APPLICATIONS (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the 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 the neat circuit diagram of 1 full-converter drive for separately excited dc motor. Explain its operation with the help of wave forms for continuous armature current. [12] b) State and define different dc motor performance parameters. [6] Q2) a) Draw a neat circuit diagram of 3 semiconverter drive for separately excited dc motor. Sketch the following waveforms for continuous armature current. [8] i) Phase supply voltages (R, Y and B). ii) Armature voltage. iii) Armature current. b) The speed of 20 HP, 300 V, 1800 rpm separately excited dc motor is controlled by 3 full converter drive. The field current is also controlled by 3 full-converter and is set to the maximum possible value. The ac input is 3 , star connected, 208 V150H2 Rf = 250 , Ra = 0.35 . The motor voltage constant Kv = 1.15 V/A - rad/sec. The armature and field current continuous and ripplefree. Determine the following [8] The delay angle of armature converter ( rated power at rated speed. a ), Q3) a) Compare HVDC and HVAC transmission. if the motor supplies the [6] b) Explain circulating and non-circulating mode of dual converter dc motor drive. [10] P.T.O. Q4) a) Explain a bipolar drive for stepper motor. Which stepper motors needs bipolar drive? [8] b) Explain principle of dielectric heating. State the applications of dielectric heating. [8] Q5) Write short notes : [16] a) Traction drive. b) Electronic Ballast. c) Requirements of stepper motor drive. SECTION - II Q6) a) Draw a neat circuit diagram of slip power recovery system using solid state scherbuis system. Explain its operation. [10] b) Explain the need of softstart for induction motor. How will you achieve it for different loads? [8] Q7) a) Explain true synchronous mode operation of synchronous motor. [8] b) Compare synchronous motor drive with induction motor drive. [4] c) Explain why the v/f ratio is kept constant for synchronous motor. [4] Q8) a) Explain the operation of 3 brushless dc motor drive with the help of necessary waveforms. [8] b) Explain vector control system of induction motor. [8] Q9) a) Draw block diagram of microprocessor based dc motor control system. State the various functions to be performed by microprocessor in this system. [10] b) Compare dedicated hardware system with microprocessor based control for variable speed drives. [6] Q10) Write short note : [16] a) Electric drives used in steel industry. b) Transistor inverter fed induction motor drive. c) Microstepping in stepper motor. xxxx [3664]-58 2

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