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What are LED ? Give their uses and merit...

What are LED ? Give their uses and merits.

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AAKASH SERIES-SEMICONDUCTOR DEVICES-Exercise (Short answer questions)
  1. What is the effect of temperature on extrinsic semi conductor?

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  2. Discuss the behaviour of p-n junction. How does a potential barrier de...

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  3. Draw and explain the current -voltage (I-V) characteristic curves of a...

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  4. If the doping concentration in a P-N junction diode is increased, will...

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  5. What is a avalanche breakdown ? How does it vary with temperature ?

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  6. Zener breakdown takes place if

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  7. Describe how a semiconductor diode is used as a half wave rectifier an...

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  8. Describe the full wave rectifier and write the expression for its effi...

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  9. How does the reverse saturation current in a P-N diode vary with tempe...

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  10. Explain the reason for getting a constant reverse saturation current w...

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  11. What is a photodiode? Explain its working with a circuit diagram and d...

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  12. Draw a circuit diagram of L.E.D. What are its advantages?

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  13. Why is the collector of a transistor made wider than emitter and base ...

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  14. The transistor parameters, namely alpha and beta of a transistor are ...

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  15. What is an amplifier? None different types of amplifiers.

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  16. Draw a circuit diagram of C.E. transistor amplifier. Briefly explain ...

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  17. Explain what is meant by feedback. Write relation between the gain wit...

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  18. Explain, with the help of a circuit diagram, the working of a photo di...

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  19. What are LED ? Give their uses and merits.

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  20. Write about solar cells.

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