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Power Electronics Question Paper - Jun 19 - Electronics Engineering (Semester 7) - Mumbai University (MU)
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Power Electronics - Jun 19

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.

Answer the following:-

1.a. Explain the need of harmonic neutralization in the output of inverter.
(5 marks) 00

1.b. Discuss the principle of phase control in single phase full wave a.c. voltage controller.
(5 marks) 00

1.c. Explain the importance of snubber circuit with diagram.
(5 marks) 00

1.d. Explain the principle of operation of cyclo converter. Enumerate some of the industrial application.
(5 marks) 00

2.a. Explain with neat diagram and waveform the operation of single phase full bridge voltage source inverter.
(10 marks) 00

2.b.
(10 marks) 00

3.a.
(10 marks) 00

3.b. Draw and explain the switching characteristics of SCR during its turn on and turn off process.
(10 marks) 00

4.a. With the help of neat diagram and associated waveform discuss the operation of Cuk convertor.
(10 marks) 00

4.b.
(10 marks) 00

5.a. Explain the operating principle of an IGBT on the basis of: 1.Creation of an inversion layer 2.Conductivity modulation of the drift layer.
(10 marks) 00

5.b.Explain the need of communication in thyristors circuit. Enumerate the various communication techniques used for thyristors. Describe class 'D' communication with relevant waveform.
(10 marks) 00

6.a. Explain the various triggering modes of triac with need diagram. Also draw it's V-1 characteristics.
(5 marks) 00

6.b. Explain the operation of single phase, half controlled bridge converter with RL load. Derive the expression for average load voltage and load current.
(10 marks) 00

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