Electrical Engineering MCQs

Page No. 87

When load current is zero, the Zener current will be_____________?


aZero

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bMinimum

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cMaximum

✓


dNone of the above

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View Answer Maximum

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?


a10 O

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b20 O

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c15 O

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d40 O

✓


View Answer 40 O

A Zener regulator _____________ in the power supply?


aIncreases the ripple

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bDecreases the ripple

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cNeither increases nor decreases the ripple

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d Data insufficient

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View Answer Decreases the ripple

The Zener current will be minimum when_____________?


aLoad current is maximum

✓


bLoad current is minimum

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cLoad current is zero

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dNone of the above

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


a15 V

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b5 V

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c30 V

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d45 V

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View Answer 30 V

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?


a10%

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b20%

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c 15%

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d5%

✓


View Answer 5%

The load voltage is approximately constant when a Zener diode is ________________?


aForward biased

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bUnbiased

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cReverse biased

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dOperating in the breakdown region

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If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?


aIncreases

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b Decreases

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cStays the same

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dNone of the above

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View Answer Decreases

If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?


aIncreases

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bDecreases

✓


cStays the same

✖


dNone of the above

✖


View Answer Decreases

In a loaded Zener regulator, which is the largest Zener current ?


aSeries current

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b Zener current

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cLoad current

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dNone of the above

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View Answer Series current

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