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A semiconductor has electron mobility as...

A semiconductor has electron mobility as `2.2 xx 10^4 cm^2V^-1S^-1` andhole mobility as `1.5 xx 10^2 cm^2 V^-1S^-1`. If the electron concentration in this semiconductor is `40 xx 10^12 cm^-3` and hole concentration as `7 xx 10^14 cm^-3`. Find the type of semiconductor and its conductivity.

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Semiconductor Devices-Exercise
  1. A common emitter (CE) transistor has a current gain of 100. If emitter...

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  2. A common emittertransistor has current gain of 96. If base current is ...

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  3. A semiconductor has electron mobility as 2.2 xx 10^4 cm^2V^-1S^-1 andh...

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  4. Draw a circuit diagram with a p-n junction in forward bias.

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  5. Draw a circuit diagram with a p-n junction atreverse bias.

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  6. State the factors, which controls intensity of light, emitted by a LED...

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  7. Draw a circuit diagram to show how a photodiode is biased.

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  8. State the factors, which controls wavelength of light, emitted by a LE...

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  9. What do you mean by depletion region in a p-n junction ?

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  10. Draw a PN-Junction with reverse bias.

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  11. Write briefly, how a Zener diode acts as voltage regulator.

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  12. Write in brief about Photo-diodes.

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  13. Explain the terms depletion layer

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  14. Explain the terms potential barrier for a junction diode.

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  15. In a transistor, base is made very thin.Explain.

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  16. Why a transistor cannot be used as a rectifier ?

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  17. The resistance of a p-n junction is low, when forward biased and is hi...

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  18. What is photo cell ? State its three applications.

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  19. Write briefly, how a Zener diode acts as voltage regulator.

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  20. Why does the thickness of depletion layer of pn-junction increases in ...

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