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EE2301 Power Electronics - Monthly Test Question Paper (Unit 1 and 2) with solution
#1


Anna University
Department of EEE

Semester : 5
Year : 3

Note :
Answer to these questions page no is given based on the Book : Power Electronics by Dr.J.S.Chirode (Technical Publication) - Reprint July 2011

Part A

1.Advantage of IGBT over MOSFET.

Answer : Page no : 1.139

2.Define Switching losses

3.Define Pinchoff voltage of MOSFET.

Answer : Page no : 1.138

4.State Requirement of Gate drive.

Answer : Page no : 1.33

5.Define Commutation of Thyristor.

6.Difference Between Natural and Forced Commutation.

Answer : Page no : 1.143

7.Define Displace factor.

Answer : Page no : 2.113

8.Under What condition a single phase fully controlled gets operated as an inverter ?

Answer : Page no : 2.113

9.Advantage of semi converter bridge over full converter bridge.

10.In class D commutation circuit Vs = 230v , L = 20mh , C= 40mf. Calculate Peak value current through capactance through main auxillary thyristor.

Part B

11.Explain Different modes of Thyristor with the help of VI Characteristics.

12. Explain IGBT.

Answer : Page no : 1.65

13. Explain MOSFET.

Answer : Page no : 1.59

14. Explain Operation of Single Phase Full Converter with neat diagram and expression for RMS and output voltage for RLE.

15. A Single phase full converter is supplied from 230 V, 50 Hz source. The Load consists of R = 10 ohm and a large inducatance so as to render the load current constant. For a firing angle delay of 30 , determine :
i) Average output voltage,
ii) Average output current,
iii)Average and rms values of thyristor currents,
iv) The Power factor.

Answer : Page no 2.40

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