Power Electronics Question Paper - Dec 18 - Electronics Engineering (Semester 7)

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Power Electronics - Dec 18

Electronics Engineering (Semester 7)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

Q.1 Attempt the following Questions(any4)

1.a. Equivalent circuit and circuit symbol of IGBT

(5 marks) 00

1.b. Compare Self commutation and Class D Commutation

(5 marks) 00

1.c. What is difference between a cycloconverter and an ac voltage controller

(5 marks) 00

1.d. What are the performance parameters of Inverter ,give effect of crass conduction

(5 marks) 00

1.e. Explain brief step Down /Buck switching Regulator

(5 marks) 00

1.f. Calculate output voltage for a step up chopper with Vin= 200v and duty cycle= 0.25.

(5 marks) 00

2.a. What are the over current protection SCR? State the crossbar protection circuit of SCR, Explain the metal oxide Varistors

(10 marks) 00

2.b. What is difference between a cycloconverter and an ac voltage controller, Explain single phase converters with waveforms

(10 marks) 00

3.a.

(10 marks) 00

3.b. Draw and Explain Buck-Boost Converter with the help of circuit diagram and waveforms Derive the relation for load voltage

(10 marks) 00

4.a. A SINGLE quadrant DC to DC converter is operated with following specifications 1.ideal battery of 220V 2.ON time $t_{ON}$ =2msec.3.OFF time $t_{OFF}$=1.5msec. To find 1.Average and RMS out put Voltage 2.RippleFactor and Form Factor

(10 marks) 00

4.b. Draw and Explain Structure of power MOSFET? State STATIC & SWITCHING Characteristics, power MOSFET with forward blocking and applications of power MOSFET

(10 marks) 00

5.a. Draw and Explain single phase half controlled rectifier with symmetrical configuration with highly inductive Load draw the waveforms

(10 marks) 00

5.b.

(10 marks) 00

Write short note on:

6.a. Full wave controlled rectifiers with R load with waveforms.

(20 marks) 00

6(b)

(5 marks) 00

6.c.

(5 marks) 00

6.d. Construction and operation of IGBT

(5 marks) 00

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