PE IMP

 GOVERMENT POLYTECHNIC GANDHINAGAR

ELELCTRICAL

 IMP QUSTIONS   FOR  PE

Subject: POWER ELECTRONICS

1. Draw and Explain Jones Chopper. 

2. Explain the working principle of DC Chopper. 

3. Draw and Explain Class D chopper with necessary waveforms. 

4. Explain three phase full wave bridge rectifier. 

5. State different method of mounting of SCR. Explain any two. 

6. Draw and Explain working of Cycloconverter. 

7. Write advantage and disadvantages of Pulse Width Modulation. State 

different methods of PWM control & explain single PWM control. 

8. Draw and Explain Single Phase Series Inverter. 

9. Draw and Explain Single phase to single phase bridge type Cycloconverter 

for Resistive load. 

10.Draw and Explain Morgan’s Chopper. 

11.Explain Time ratio control and current control of Chopper. 

12.Explain static circuit breaker using SCR. 

13.Draw and Explain speed control of universal motor using SCR. 

14.Draw and Explain RC phase shift control of SCR. 

15.Draw and Explain construction and working of IGBT using characteristics. 

16.Explain speed control of DC drive using PLL method. 

17.Draw and Explain speed control of DC Motor by armature voltage control. 

18.Draw and Explain Class B commutation of SCR. 

19.Explain triggering control of SCR using UJT. 

20.Explain Class-C commutation of SCR with circuit and waveforms. 

21.Explain over voltage protection for SCR. 

22.What is function of freewheeling diode in converter? Explain its working 

with circuit and waveforms. 

23.Draw two transistor analogy of SCR and explain its working. 

24.Explain speed control of slip-ring induction motor using chopper. 

25.Explain working of step-up chopper. 

26.Explain Type-E chopper with circuit. 

27.Write short note on pulse transformer. 

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28.Explain working of AC timer circuit. 

29.Explain control of A.C. load using Triac and Diac. 

30.Explain the construction & working of MCT. 

31.Explain the working principle of Inverter & write its classification. 

32.State Advantages of Polyphase Rectifier over single phase Rectifier. 

33.Explain heat control using SCR. 

34.State the methods for speed control of induction motor and explain any 

one with circuit diagram. 

35.Draw and explain turn off characteristics of SCR. 

36.Draw and Explain Characteristics of IGBT. 

37.Compare three phase Half wave and full wave rectifier

38.Explain AC load control using SCR. 

39.Explain power rating of SCR. 

40.Write the application of cyclo convert