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EEE :: Semiconductor Theory Multiple

  1. The strength of a semiconductor crystal comes from

  2. A.

     Forces between nuclei

    B.

     Forces between protons

    C.

     Electron-pair bonds

    D.

     None of the above


  3. The impurity level in an extrinsic semiconductor is about of pure semiconductor.

  4. A.

     10 atoms for 108 atoms

    B.

     1 atom for 108 atoms

    C.

     1 atom for 104 atoms

    D.

     1 atom for 100 atoms


  5. A hole and electron in close proximity would tend to ___________

  6. A.

     Repel each other

    B.

     Attract each other

    C.

     Have no effect on each other

    D.

     None of the above


  7. A semiconductor has generally ___________ valence electrons.

  8. A.

     2

    B.

     3

    C.

     6

    D.

     4


  9. A pentavalent impurity has ___________ Valence electrons

  10. A.

     3

    B.

     5

    C.

     4

    D.

     6


  11. A forward biased pn junction diode has a resistance of the order of

  12. A.

     Ω

    B.

     kΩ

    C.

     MΩ

    D.

     None of the above


  13. A reverse biased pn junction has resistance of the order of

  14. A.

     Ω

    B.

     kΩ

    C.

     MΩ

    D.

     None of the above


  15. A semiconductor has ___________ temperature coefficient of resistance.

  16. A.

     Positive

    B.

     Zero

    C.

     Negative

    D.

     None of the above


  17. At room temperature, an intrinsic semiconductor has ___________

  18. A.

     Many holes only

    B.

     A few free electrons and holes

    C.

     Many free electrons only

    D.

     No holes or free electrons


  19. At absolute temperature, an intrinsic semiconductor has ___________

  20. A.

     A few free electrons

    B.

     Many holes

    C.

     Many free electrons

    D.

     No holes or free electrons