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EEE :: Regulated DC Power Supply

  1. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?

  2. A.

     15 V

    B.

     5 V

    C.

     30 V

    D.

     45 V


  3. An ideal regulated power supply is one which has voltage regulation of ___________

  4. A.

     0%

    B.

     5%

    C.

     10%

    D.

     1%


  5. If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?

  6. A.

     10%

    B.

     20%

    C.

     15%

    D.

     5%


  7. The load voltage is approximately constant when a Zener diode is ___________

  8. A.

     Forward biased

    B.

     Unbiased

    C.

     Reverse biased

    D.

     Operating in the breakdown region


  9. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?

  10. A.

     8 V

    B.

     7 V

    C.

     6 V

    D.

     2 V


  11. In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance?

  12. A.

     10 Ω

    B.

     50 Ω

    C.

     25 Ω

    D.

     40 Ω


  13. As the junction temperature increases, the voltage breakdown point for Zener mechanism ___________

  14. A.

     Is increased

    B.

     Is decreased

    C.

     Remains the same

    D.

     None of the above


  15. As the junction temperature increases, the voltage breakdown point for avalanche mechanism ___________

  16. A.

     Remains the same

    B.

     Decrease

    C.

     Increases

    D.

     None of the above


  17. For increasing the voltage rating, zeners are connected in ___________

  18. A.

     Parallel

    B.

     Series-parallel

    C.

     Series

    D.

     None of the above


  19. When load current is zero, the Zener current will be

  20. A.

     Zero

    B.

     Minimum

    C.

     Maximum

    D.

     None of the above