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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16.
A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?

More than

Less than

Equal to

None of the above

17.
What is true about the breakdown voltage in a Zener diode ?

It decreases when load current increases

It destroys the diode

It equals current times the resistance

It is approximately constant

18.
A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?

1 O

1 O

100 O

10 O

19.
The current in a Zener diode is limited by _______________?

External resistance

Power dissipation

Both (A) and (B)

None of the above

20.
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 ?

09%

87 %

72 %

None of the above

21.
A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?

Avalanche

Zener

Both avalanche and Zener

None of the above

23.
A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes______________?

Less than load current

Zero

More than load current

None of the above

25.
For increasing the voltage rating, zeners are connected in_____________?

Parallel

Series-parallel

Series

None of the above

26.
In a Zener voltage regulator, the changes in load current produce changes in _________________?

Zener current

Zener voltage

Zener voltage as well as Zener current

None of the above

27.
If the doping level is increased, the breakdown voltage of the Zener_______________?

Remains the same

Is increased

Is decreased

None of the above

29.
As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?

Remains the same

Decrease

Increases

None of the above

30.
A Zener diode is used as a _____________voltage regulating device?

Shunt

Series

Series-shunt

None of the above

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