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 of the output voltage is :

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Solution

The correct option is C

The explanation for the correct option
Since there are two reverse-polarized Zener diodes, if one is operating in forward bias, the other will be operating in reverse bias, and beyond $6 V$ , the reverse bias will also be operating in conduction mode.
As a result, the output will remain constant when the voltage exceeds $6 V$ . Additionally, if the voltage is lower than $6 V$ , it will follow the input voltage.
Hence option C is the correct answer.

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Q. 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)

Two Zener diodes (A and B) having breakdown voltages of $ 6V$ and $ 4V$ respectively, are connected as shown in the circuit below. The output voltage $ {V}_{O}$ variation with input voltage linearly increasing with time is given by $ \left({V}_{input}=0V at t=0\right)$ (figures are qualitative).