Sunday, November 14, 2010




  1. What is low pass filter?
  2. How many types of filters are there?
  3. What is first order and second order low pass filter? Differentiate between these two.
  4. How a first order low pass filter converted into a second order type filter?
  5. What is gain of LPF?
  6. Why the graph of second order filter became constant and then decreasing?
  7. What is pass band and stop band for a low pass filter?
  8. What is active high pass filter? Explain.
  9. What is the difference between low pass and high pass filter?
  10. Explain the graph for a active high pass filter.
  11. Explain active band pass filters.
  12. How many types of band pass filters are there?
  13. What is quality factor, and what will be the quality factor for same?
  14. In active band pass filter at some particular frequencies the output remains same, why is it so?
  15. Explain active band rejector filter, and differentiate between active band pass and active band rejector filter.
  16. What is band elimination filter?
  17. What is figure of merit?
  18. What is twin-T notch filter? And why it is used in active notch filter?
  19. At some particular designed frequencies, the voltage reaches maximum value, explain about it.
  20. What is modulation? Why modulation is needed in communication channels?
  21. What is an amplifier, tell me something about error amplifier, phase detector, voltage controlled oscillator(VCO).
  22. What is demodulation? Where is it need?
  23. What is phase locked loop(PLL)?
  24. Define following- i) Lock range         ii) Capture range         iii) Pull-in time.
  25. What is collector modulation?
  26. Why IFT and AFT is to be used in this type of circuit?
  27. Give a design for modulation and demodulation of the collector modulation circuit.
  28. What is pulse amplitude modulation?
  29. What does sampling theorem states about PAM?
  30. With respect to input sine wave explain the output of PAM.
  31. Differentiate between pulse width modulation(PWM) and PAM?
  32. Give the advantage and disadvantages of both PWM and PAM.
  33. Explain all about pulse position modulation.
  34. Why PWM signal is used as an input for PPM circuits?
  35. Explain Frequency modulation, here which IC is used to produce the desired wave?
  36. What is frequency sweeping?
  37. Explain the graph obtained from a FM signal with respect to input signal for IC 8038.
  38. What is modulation index and transmission bandwidth?
  39. What is tuned amplifier? Define class C tuned amplifier.
  40. Why it is called “tuned amplifier”?
  41. What should be the performance obtained from class C tuned amplifier?
  42. Give the application of class C tuned amplifier.
  43. Why class C tuned amplifier is used in a transmitter or receiver, why not class A or class B, or class AB, D, E?
  44. Define the power for a class c tuned amplifier.
  45. What is conduction angle?

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