Regulated D.C. Power Supply

1. A 30 V Zener will have depletion layer width __________ that of 10 V Zener

  1. More than
  2. Less than
  3. Equal to
  4. None of the above

Correct answer: (A)
More than

2. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance?

  1. 1 O
  2. 1 O
  3. 100 O
  4. 10 O

Correct answer: (D)
10 O

3. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation?

  1. 09%
  2. 87 %
  3. 72 %
  4. None of the above

Correct answer: (A)
09%

4. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?

  1. 10 O
  2. 20 O
  3. 15 O
  4. 40 O

Correct answer: (D)
40 O

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

  1. 8 V
  2. 7 V
  3. 6 V
  4. 2 V

Correct answer: (A)
8 V

6. A power supply which has voltage regulation of __________ is unregulated power supply

  1. 0 %
  2. 5 %
  3. 10 %
  4. 8%

Correct answer: (C)
10 %

7. A Zener diode __________

  1. Is a battery
  2. Acts like a battery in the breakdown region
  3. Has a barrier potential of 1 V
  4. Is forward biased

Correct answer: (B)
Acts like a battery in the breakdown region

8. A Zener diode is used as a __________ voltage regulating device

  1. Shunt
  2. Series
  3. Series-shunt
  4. None of the above

Correct answer: (A)
Shunt

9. A Zener diode that has very narrow depletion layer will breakdown by __________ mechanism

  1. Avalanche
  2. Zener
  3. Both avalanche and Zener
  4. None of the above

Correct answer: (B)
Zener

10. A Zener diode utilises __________ characteristic for voltage regulation

  1. Forward
  2. Reverse
  3. Both forward and reverse
  4. None of the above

Correct answer: (B)
Reverse

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