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Semiconductor Diode Multiple - Section-1
  1. A crystal diode utilises ___________ characteristic for rectification

    2. A.

     reverse
    B.

     forward
    C.

     forward or reverse
    D.

     none of the above

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  2. The ripple factor of a half-wave rectifier is ___________

    3. A.

     2
    B.

     1.21
    C.

     2.5
    D.

     0.48

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  3. The maximum efficiency of a half-wave rectifier is ___________

    4. A.

     40.6%
    B.

     81.2%
    C.

     50%
    D.

     25%

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  4. The most widely used rectifier is ___________

    5. A.

     half-wave rectifier
    B.

     centre-tap full-wave rectifier
    C.

     bridge full-wave rectifier
    D.

     none of the above

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  5. A zener diode has ___________

    6. A.

     one pn junction
    B.

     two pn junctions
    C.

     three pn junctions
    D.

     none of the above

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  6. If the doping level in a crystal diode is increased, the width of depletion layer___________

    7. A.

     remains the same
    B.

     is decreased
    C.

     in increased
    D.

     none of the above

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  7. A series resistance is connected in the zener circuit to___________

    8. A.

     properly reverse bias the zener
    B.

     protect the zener
    C.

     properly forward bias the zener
    D.

     none of the above

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  8. The forward voltage drop across a silicon diode is about ___________

    9. A.

     2.5 V
    B.

     3 V
    C.

     10 V
    D.

     0.7 V

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  9. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________

    10. A.

     1 : 1
    B.

     100 : 1
    C.

     1000 : 1
    D.

     40000 : 1

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  10. The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode

    11. A.

     the same as
    B.

     lower than
    C.

     more than
    D.

     none of the above

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