Digital Electronics Interview Questions

by admin on August 29, 2012

Digital electronics signify signals by distinct bands of analog levels, instead of continuous range. Each and every level of a band signifies the same state of the signal. Comparatively, when small changes are done to the analog signal levels because of manufacturing tolerance, parasitic noise or signal attenuation does not leave the envelope, and therefore signal state sensing circuitry ignores it.

Following are some sample questions on Digital Electronics:

  1. Explain the difference between FIFO and RAM
  2. How to execute a full subtractor from a full adder?
  3. Define multiplexer
  4. Explain the difference between D flip-flop and a D latch?
  5. Explain two ways to convert a 2 input NAND gate an inverter?
  6. What happens when contents of a register are shifted left to right?
  7. How to implement an AND gate by using MUX?
  8. Name some of the applications of a buffer
  9. What is importance of cas and ras in SDRAM?
  10. Can you achieve 180 degree exact phase shift? How?
  11. How to determine longest path?
  12. How to determine maximum operating frequency?
  13. Explain the difference between one-hot and binary encoding?
  14. Explain the difference between moore and mealy state machines?
  15. How to develop a 4:1 MUX by using 2:1 MUX?
  16. Name two XOR gates among which one can function as buffer and the other as inverter?
  17. What is meant by waveform, and how to overcome it?
  18. Define is meant by glitch?
  19. Define slack
  20. Define skew. What are the issues associated with skew, and how to overcome them?
  21. What is meant by setup time and hold time? What happens when the setup and hold time violation occur? How to overcome it?
  22. Why do we call an excess-4 code as unweighted code?
  23. Define BCD. Explain its advantages and disadvantages.
  24. How to design gray to binary code converter?
  25. How to recognize the number of states that the ripple counter has, just by looking at the figure even though it may have some invalid states?
  26. Explain the purpose of the package that is present around a microprocessor silicon die
  27. Explain the main difference between 8086 and 8085?
  28. Explain the difference between a flip-flop and a latch?
  29. What are the frequency bands that you can use in satellite communication?
  30. Explain the benefits of using C band for satellite communication
  31. How to develop CMOS inverter?
  32. Explain ASCII
  33. What is EBCDIC?
  34. What is meant by 3db cutoff frequency? Why is it called so?
  35. What is de-emphasis and pre-emphasis?
  36. Why BFSK is less efficient when compared to BPFSK?
  37. Why do you use VSB-C3F (vestigial side band) transmission for picture?
  38. What is the type of modulation that is used in Television transmission?
  39. What is the necessity of modulation?
  40. What is the signals range that you can use for terrestrial transmission?
  41. What is full-duplex communication? And what is half-duplex communication?
  42. Define CMRR
  43. What are the pros and cons of FIR filters than IIR counterparts?
  44. Define response
  45. Define sampling theorem
  46. Why is it necessary to filter actual response and ideal response of filters?
  47. What are the types of filters?
  48. What is zener breakdown?
  49. What is avalanche breakdown?
  50. What is an ideal voltage source?
  51. Which semiconductor device that you can use as a voltage regulator? Why?
  52. Define race-around problem
  53. How to convert a JK Flip-flop to a D Flip-flop?
  54. How to convert an SR Flip-flop to a JK Flip-flop?
  55. Define multiplexer?
  56. Explain the difference between Flip flops and Latches?
  57. What is D-FF?

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