Electrical Engineering MCQs

Page No. 87

When load current is zero, the Zener current will be_____________?


aZero


bMinimum


cMaximum


dNone of the above


View Answer Maximum

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?


a10 O


b20 O


c15 O


d40 O


View Answer 40 O

A Zener regulator _____________ in the power supply?


aIncreases the ripple


bDecreases the ripple


cNeither increases nor decreases the ripple


d Data insufficient


View Answer Decreases the ripple

The Zener current will be minimum when_____________?


aLoad current is maximum


bLoad current is minimum


cLoad current is zero


dNone of the above



Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?


a15 V


b5 V


c30 V


d45 V


View Answer 30 V

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?


a10%


b20%


c 15%


d5%


View Answer 5%

The load voltage is approximately constant when a Zener diode is ________________?


aForward biased


bUnbiased


cReverse biased


dOperating in the breakdown region



If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?


aIncreases


b Decreases


cStays the same


dNone of the above


View Answer Decreases

If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?


aIncreases


bDecreases


cStays the same


dNone of the above


View Answer Decreases

In a loaded Zener regulator, which is the largest Zener current ?


aSeries current


b Zener current


cLoad current


dNone of the above


View Answer Series current

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