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Electrical Engineering
Regulated DC Power Supply
Quiz 1
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Q.1
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?
3.09
2.87
5.72
None of the above
Q.2
In an unregulated power supply, if input a.c. voltage increases, the output voltage .
Increases
Decreases
Remains the same
None of the above
Q.3
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
Q.4
In a 15 V Zener diode , the breakdown mechanism will occur by ___________
Avalanche mechanism
Zener mechanism
Both Zener and avalanche mechanism
None of the above
Q.5
Commercial power supplies have voltage regulation ___________
of 10%
of 15%
of 25%
within 1%
Q.6
If the doping level is increased, the breakdown voltage of the Zener ___________
Remains the same
Is increased
Is decreased
None of the above
Q.7
A Zener diode utilises ___________ characteristic for voltage regulation
Forward
Reverse
Both forward and reverse
None of the above
Q.8
In a loaded Zener regulator, which is the largest Zener current?
Series current
Zener current
Load current
None of the above
Q.9
Another name for Zener diode is ___________ diode
Breakdown
Voltage
Power
Current
Q.10
The current in a Zener diode is limited by ___________
External resistance
Power dissipation
Both (A) and (B)
None of the above
Q.11
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 Ω
20 Ω
15 Ω
40 Ω
Q.12
The Zener current will be minimum when ___________
Load current is maximum
Load current is minimum
Load current is zero
None of the above
Q.13
A Zener diode ___________
Is a battery
Acts like a battery in the breakdown region
Has a barrier potential of 1 V
Is forward biased
Q.14
The rupture of covalent bonds will occur when the electric field is ___________
100 V/cm
0.6 V/cm
1000 V/cm
More than 10⁵ V/cm
Q.15
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
Q.16
A Zener diode is used as a ___________ voltage regulating device
Shunt
Series
Series-shunt
None of the above
Q.17
A power supply which has voltage regulation of ___________ is unregulated power supply
0%
5%
10%
8%
Q.18
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 Ω
50 Ω
25 Ω
40 Ω
Q.19
As the junction temperature increases, the voltage breakdown point for Zener mechanism ___________
Is increased
Is decreased
Remains the same
None of the above
Q.20
As the junction temperature increases, the voltage breakdown point for avalanche mechanism ___________
Remains the same
Decrease
Increases
None of the above
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