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PART B
Answer any 8 complete questions each having 5 marks

21. Discuss the colour coding scheme of capacitors? Write the colour band sequence for the
capacitance 470 pF?

22. With a neat figure, explain the construction of a carbon film resistor and mention its features.

23. Explain the working principle of LED? Explain the generation of different colours in LED with
example.

24. Draw the output characteristics of a PNP transistor in CE mode and explain the three regions of
operation.

25. Explain the principle of working of a Zener diode? Differentiate between Zener and Avalanche
breakdown mechanisms?

26. Draw the circuit diagram of RC phase shift oscillator. How does the circuit satisfy the
Barkhausen criteria?

27. Explain the operation of a bridge rectifier with circuit diagram and show that the ripple factor is
0.48.

28. Explain the operation of RC coupled amplifier with circuit diagram and frequency response.

29. State and explain De-Morgan’s theorem.
Realize the Boolean expression X=AB + BC using any one of the universal gates and write the

truth table.

30. Draw the block diagram of a function generator and specify the functions of each block.

Answer any 4 complete questions each having 5 marks

31. Draw the block diagram of FM receiver and explain the functions of each block with
waveforms.

32. Draw the block diagram of a RADAR and describe the method for measuring the range of an
object.

33. Briefly explain satellite communication system with a block diagram.

34. What is the principle of operation of GSM? What are the services offered by GSM

35. Sketch the elements associated with an optical fiber communication system and describe the
major light detectors.

36. With illustrations, explain the working of plasma display and mention its advantages and

disadvantages.

2

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