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Question

Take the breakdown voltage of the Zener diode used in the given circuit as 6 V for the input voltage shown in figure below, the time variation output voltage is-
(graphs drawn schematic and not to scale)


A
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C
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Solution

The correct option is C
Here, the given two Zener diodes are in reversed polarity so if one is in forward bias the other will be in reverse bias and above 6 V the reverse bias will be in conduction mode.

Hence, when Vin>6V the output will be constant and when Vin>6V it will follow the input voltage.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (C) is the correct answer.

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