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EEE :: Regulated DC Power Supply

  1. A Zener diode ___________

  2. A.

     Is a battery

    B.

     Acts like a battery in the breakdown region

    C.

     Has a barrier potential of 1 V

    D.

     Is forward biased


  3. The rupture of covalent bonds will occur when the electric field is ___________

  4. A.

     100 V/cm

    B.

     0.6 V/cm

    C.

     1000 V/cm

    D.

     More than 10⁵ V/cm


  5. What is true about the breakdown voltage in a Zener diode?

  6. A.

     It decreases when load current increases

    B.

     It destroys the diode

    C.

     It equals current times the resistance

    D.

     It is approximately constant


  7. A Zener diode is used as a ___________ voltage regulating device

  8. A.

     Shunt

    B.

     Series

    C.

     Series-shunt

    D.

     None of the above


  9. A power supply which has voltage regulation of ___________ is unregulated power supply

  10. A.

     0%

    B.

     5%

    C.

     10%

    D.

     8%


  11. Commercial power supplies have voltage regulation ___________

  12. A.

     of 10%

    B.

     of 15%

    C.

     of 25%

    D.

     within 1%


  13. If the doping level is increased, the breakdown voltage of the Zener ___________

  14. A.

     Remains the same

    B.

     Is increased

    C.

     Is decreased

    D.

     None of the above


  15. Another name for Zener diode is ___________ diode

  16. A.

     Breakdown

    B.

     Voltage

    C.

     Power

    D.

     Current


  17. The current in a Zener diode is limited by ___________

  18. A.

     External resistance

    B.

     Power dissipation

    C.

     Both (A) and (B)

    D.

     None of the above


  19. The Zener current will be minimum when ___________

  20. A.

     Load current is maximum

    B.

     Load current is minimum

    C.

     Load current is zero

    D.

     None of the above