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

8 V 7 V 6 V 2 V
Answer Explanation

MCQs 2: 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 ?

10 O 50 O 25 O 40 O
Answer Explanation

MCQs 3: When load current is zero, the Zener current will be_____________?

Zero Minimum Maximum None of the above
Answer Explanation

MCQs 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?

10 O 20 O 15 O 40 O
Answer Explanation

MCQs 5: A Zener regulator _____________ in the power supply?

Increases the ripple Decreases the ripple Neither increases nor decreases the ripple Data insufficient
Answer Explanation

MCQs 6: The Zener current will be minimum when_____________?

Load current is maximum Load current is minimum Load current is zero None of the above
Answer Explanation

MCQs 7: Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?

15 V 5 V 30 V 45 V
Answer Explanation

MCQs 8: 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?

10% 20% 15% 5%
Answer Explanation

MCQs 9: The load voltage is approximately constant when a Zener diode is ________________?

Forward biased Unbiased Reverse biased Operating in the breakdown region
Answer Explanation

MCQs 10: If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?

Increases Decreases Stays the same None of the above
Answer Explanation

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