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.
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
Answer & Solution
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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
Answer & Solution
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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
22. A Zener voltage regulator is used for ____________ load currents?
High
Very high
Moderate
Small
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
24. Another name for Zener diode is ______________diode?
Breakdown
Voltage
Power
Current
Answer & Solution
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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
Answer & Solution
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27. If the doping level is increased, the breakdown voltage of the Zener_______________?
Remains the same
Is increased
Is decreased
None of the above
Answer & Solution
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28. Zener diode are generally made of _____________?
Germanium
Silicon
Carbon
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
Answer & Solution
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30. A Zener diode is used as a _____________voltage regulating device?
Shunt
Series
Series-shunt
None of the above