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Questions:

1. Explain the mechanism of electrical conduction in a semiconductor.
2. Define and explain Fermi level.
3. Explain the effect of temperature on the reverse saturation current in a junction diode.
4. Describe the action of a FET as a switch in an electronic circuit.
5. Explain ripple factor.
6. Distinguish between junction field effect transistor and bipolar junction transistor.
7. What is the necessity of having a filter in a power supply?
8. Why does RC coupling give constant gain over the mid-frequency range?
9. What do you mean by Enhancement mode of a MOSFET?
10. Derive an expression for the densities of free electrons and holes in an intrinsic semiconductor. Show that the Fermi level lies halfway between the conduction and valence band.
11. What is a tunnel diode? Draw its characteristic curve and explain its working with the help of an energy band diagram. Mention the application of tunnel diode.
12. Define current gain parameters for common base and common emitter configurations in a transistor. Establish a relation between them.
13. Write notes on Zener breakdown and avalanche diodes.
14. Write notes on base-width modulation in a transistor.
15. Why is biasing necessary for a transistor? Describe various methods of transistor biasing. Which method is best and why?
16. Explain the construction and working principle of a Unijunction Transistor (UJT) with its V-I characteristic curve.
17. Draw the circuit diagram of a transformer-coupled transistor amplifier. Derive an expression for voltage gain at low, mid, and high frequencies.
18. Write notes on Silicon control rectifier.
19. Write notes on Phototransistor.
20. Write notes on distortion in amplifiers.