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?
A. 10 o
B. 20 o
C. 15 o
D. 40 o
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A Zener regulator _____________ in the power supply?
A. Increases the ripple
B. Decreases the ripple
C. Neither increases nor decreases the ripple
D. Data insufficient
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The Zener current will be minimum when_____________?
A. Load current is maximum
B. Load current is minimum
C. Load current is zero
D. None of the above
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Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
A. 15 v
B. 5 v
C. 30 v
D. 45 v
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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?
A. 10%
B. 20%
C. 15%
D. 5%
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The load voltage is approximately constant when a Zener diode is ________________?
A. Forward biased
B. Unbiased
C. Reverse biased
D. Operating in the breakdown region
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If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
A. Increases
B. Decreases
C. Stays the same
D. None of the above
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If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
A. Increases
B. Decreases
C. Stays the same
D. None of the above
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In a loaded Zener regulator, which is the largest Zener current ?
A. Series current
B. Zener current
C. Load current
D. None of the above
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Which of these is the best description for a Zener diode ?
A. It is a diode
B. It is a constant current device
C. It is a constant-voltage device
D. It works in the forward region
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Word of the Day
16 Sep
Incarcerate
imprison or confine.
قید کرنا، اسیری

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