ELECTRONIC DEVICES (5 marks & 3 marks)

 


The answers are under preparation. Link to answers will be made available as soon as we finalize the answers.

  1. Distinguish between conductors, insulators and semiconductors on the basis of energy bands.
  2. What are extrinsic semiconductors? Mention its types and explain the mechanism of conduction in each.
  3. Explain the conduction in N Type and P Type semiconductor on the basis of band theory.
  4. Explain the formation of depletion layer and potential barrier in a PN junction diode.
  5. Draw the circuit diagram used to determine the VI characteristics of a diode and draw the forward and reverse bias characteristics of a diode. Explain the conclusions drawn from the graph.
  6. With the help of a labeled circuit diagram explain the working of half wave rectifier and draw the input and output waveforms.
  7. With the help of a labeled circuit diagram explain the working of full wave rectifier and draw the input and output waveforms.
  8. Write notes on LED, photodiode and solar cell.
  9. What is a zener diode? Draw the VI characteristics of zener diode. Explain Zener breakdown and describe the use of a zener diode as a voltage regulator.
  10. Explain the action of a PNP transistor and an NPN transistor.(Explain how conduction takes place in NPN and PNP transistor.)
  11. Draw the circuit diagram for determining transistor characteristics and describe the input and output characterisitcs of transistor in CB configuration with relevant graphs.
  12. Draw the circuit diagram for determining transistor characteristics and describe the input and output characterisitcs of transistor in CE configuration with relevant graphs.
  13. Explain the working of Transistor amplifier in CE confihuration with necessary circuit diagram.
  14. Explain the working of transistor oscillator.
  15. Explain the working of transistor as a switch.
  16. Draw the symbol, truth table and Boolean expression for Or, AND and NOT gate.
  17. Draw the symbol and truth table of NOR gate and NAND gate.
  18. Explain how the fundamental logic gates can be realised usinf NOR gates alone.
  19. Explain how the fundamental logic gates can be realised usinf NAND gates alone.

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