Regulated D.C. Power Supply Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Regulated D.C. Power Supply ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Regulated D.C. Power Supply comprehensively.

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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

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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

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

Zero

Minimum

Maximum

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?

10 O

20 O

15 O

40 O

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5.
A Zener regulator _____________ in the power supply?

Increases the ripple

Decreases the ripple

Neither increases nor decreases the ripple

Data insufficient

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6.
The Zener current will be minimum when_____________?

Load current is maximum

Load current is minimum

Load current is zero

None of the above

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

15 V

5 V

30 V

45 V

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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%

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

Forward biased

Unbiased

Reverse biased

Operating in the breakdown region

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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

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11.
If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?

Increases

Decreases

Stays the same

None of the above

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12.
In a loaded Zener regulator, which is the largest Zener current ?

Series current

Zener current

Load current

None of the above

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13.
Which of these is the best description for a Zener diode ?

It is a diode

It is a constant current device

It is a constant-voltage device

It works in the forward region

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14.
If the load resistance decreases in a Zener regulator, then Zener current ______________?

Decreases

Stays the same

Increases

None of the above

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15.
A Zener diode______________?

Is a battery

Acts like a battery in the breakdown region

Has a barrier potential of 1 V

Is forward biased

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