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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

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

  4. A.

     0%

    B.

     5%

    C.

     10%

    D.

     1%

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  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%

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  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

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  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

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  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

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  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

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  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

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

  18. A.

     Parallel

    B.

     Series-parallel

    C.

     Series

    D.

     None of the above

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

  20. A.

     Zero

    B.

     Minimum

    C.

     Maximum

    D.

     None of the above

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