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

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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

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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

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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

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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

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

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

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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

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

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

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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

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10. A Zener diode utilises __________ characteristic for voltage regulation

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

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