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Electrical Engineering
Regulated DC Power Supply
Quiz 2
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Q.1
For increasing the voltage rating, zeners are connected in ___________
Parallel
Series-parallel
Series
None of the above
Q.2
Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
15 V
5 V
30 V
45 V
Q.3
If the load current drawn by unregulated power supply increases, the d.c. output voltage ___________
Increases
Decreases
Stays the same
None of the above
Q.4
When load current is zero, the Zener current will be
Zero
Minimum
Maximum
None of the above
Q.5
An ideal regulated power supply is one which has voltage regulation of ___________
0%
5%
10%
1%
Q.6
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%
Q.7
A 30 V Zener will have depletion layer width ___________ that of 10 V Zener
More than
Less than
Equal to
None of the above
Q.8
A Zener voltage regulator is used for ___________ load currents
High
Very high
Moderate
Small
Q.9
A Zener diode that has very narrow depletion layer will breakdown by mechanism
Avalanche
Zener
Both avalanche and Zener
None of the above
Q.10
The load voltage is approximately constant when a Zener diode is ___________
Forward biased
Unbiased
Reverse biased
Operating in the breakdown region
Q.11
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
Q.12
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
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