50 TOP MOST EDC LAB VIVA Questions and Answers – ECE

EDC LAB VIVA Questions with Answers :-

1. What is Electronic?

2. What is communication?

3. Different types of communications? Explain.

4. What is sampling?

5. State sampling theorem?

6. What is cut-off frequency?

7. What is pass band?

8. What is stop band?

9. Explain RF?

10. What is modulation? And where it is utilized?

11. What is demodulation?

12. Name the modulation techniques?

13. Explain AM and FM?

14. Where do we use AM and FM?

15. What is a base station?

16. How many satellites are required to cover the earth?

17. What is a repeater?

18. What is an Amplifier?

19. Example for negative feedback and positive feedback?

20. What is Oscillator?

EDC VIVA Questions and Answers :-


21. What is an Integrated Circuit?

22. What is crosstalk?

23. What is resistor?

25. What is inductor?

26. What is conductor?

27. What is a semi conductor?

28. What is diode?

29. What is transistor?

30. What is op-amp?

31. What is a feedback?

32. Advantages of negative feedback over positive feedback?

33. What is Barkhausen criteria?

34. What is CDMA, TDMA, FDMA?

35. explain different types of feedback?

36. What are the main divisions of power system?

37. What is Instrumentation Amplifier (IA) and what are all the advantages?

38. What is meant by impedance diagram?

39. What is the need for load flow study?

40. What is the need for base values?

41.Why are the coupling capacitors required?
To filter the Dc term from the Input signal , Collector output in amplifiers.

42.What is meant by thermal stabilization?
Maintain a constant operating point when temperature varies

43.Explain why reversal of phase occurs in a BJT CE Amplifier.
As Base voltage increases, base current increases, then collector current increases so voltage drop across Rc increases so out put voltage decreses.

44.What happens if an amplifier is biased at cutoff or at saturation?
In cutoff region Ic is 0, in saturation region Vce is almost Zero.

45.What is the significance of the bandwidth of an amplifier?
Bandwidth specifies the input signal frequency range that can be applied to amplifier to get maximum gain.

46.What is meant by Gain-Bandwidth Product? What is its significance?
The name itself expressing it is the product of gain of a device and its bandwidth. For any system (circuit) gain bandwidth product is constant, if gain increases bandwidth decreases vice versa.

47.What are the advantages of using a FET instead of a BJT?
FET has high input impedance, lower noise, low to medium gain,

48.What are the specifications of the SCR ?
gate trigger voltage, gate trigger current, holding current, on-state voltage, peak gate power dissipation.

49.Can we interchange the source and drain terminals in a FET circuit? Can we do the same with the emitter and collector terminals of a BJT circuit?
We can interchange drain and source but we cannot change emitter and collector because emitter and collectors dimensions and doping concentration is different

50.What is a MOSFET? How is it different from a JFET? What are its typical applications?
Metal oxide semiconductor can be operated in both depletion and enhancement modes, but Junction field effect Transistor can be operated in depletion mode only.

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