07-10-2015, 08:37 PM

Anna University , Chennai

Department of B.E. Electronics and Communication Engineering

Third Semester

EC6311 Analog And Digital Lab

(Regulation 2013)

IMPORTANT VIVA QUESTIONS

1. Define Logic gates

2. What is the function of X- or and X-nor gates

3. What are universal gates? Why it is called so?

4. Write the truth table for Ex-or gate and AND gate

5. What are ‘minterms’ and ‘maxterms’?

6. State and prove Demorgan’s theorem

7. Draw the logic diagram for the expression Y=AB+CD

8. What is a combinational circuit? Give example.

9. Define the following : minterm and term

10. State and prove Consensus theorem

11. What are the different types of codes?

12. What is self complementing code?

13. Perform Gray to binary and vice versa with an example

14. Perform excess-3 to BCD and vice versa with an example

15. Write about half adder and full adder

16. Truth table for half adder and full adder

17. How will you build a full adder using 2 half adders and an OR gate?

18. Write the operation of adder/subtractor circuit

19. Write the significance of adder/ subtractor circuit

20. What is BCD adder

21. With an example explain BCD adder

22. Define multiplexer

23. Define de-multiplexer

24. Applications of mux and demux

25. Other names of mux and demux

26. Implement F(A,B,C) = ∑m ( 0,2,4,5,7) using mux.

27. What are Encoder and decoder? Give its representation.

28. Applications of encoder

29. Applications of decoder

30. Difference between encoder and multiplexer

31. What is a sequential Circuit? Give example.

32. Derive the characteristic equation of a JK flip flop

33. What is the difference between a Mealy machine and a Moore Machines?

34. Distinguish between synchronous and asynchronous sequential logic circuits

35. What is a counter?

36. What are the types of counter?

37. Mention the difference between the 2 types of counters.

38. Define mod- n counter

39. What is a register?

40. Difference between flip-flop and latches

41. What is a shift register

42. Different types of register

43. What is universal shift register?

44. What is the difference between serial and parallel Register?

45. Application of shift register

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