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Questions:

1. What are semiconductors? Give examples.
2. Distinguish between intrinsic and extrinsic semiconductors.
3. Define barrier potential in PN Junction diode.
4. Write down the relation between current gain and .
5. Draw the symbol of UJT and JFET.
6. Why are the DC biases necessary in BJT amplifiers?
7. Why is common emitter configuration preferred for amplification?
8. What is meant by Q-Point and DC-load line?
9. What is a Photo diode?
10. Explain the working of PN-Junction diode in forward and reverse bias conditions.
11. Explain the principle of a solar cell. Give its construction and characteristic curve.
12. Explain the working of an N-channel FET. In what respect is it different from BJT?
13. Draw the circuit diagram of a Full-wave rectifier and explain its working.
14. Describe briefly the different classes of transistors as amplifiers.
15. Describe Zener breakdown mechanism. Draw the voltage regulation circuit using a Zener diode.
16. The of a transistor is 40/50. If base current is 200 A, find out the emitter current.
17. Describe the principle of operation of an N-channel MOSFET. Draw the drain and transfer characteristics for enhancement and depletion type N-channel MOSFET.
18. Draw the circuit diagram of an RC coupled CE-amplifier. Find its voltage gain in the middle range of frequencies.
19. What are clipper circuits? How are these classified?
20. Write short notes on Power Supply and Bridge Rectifier.