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  4. 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: (Graphs drawn are schematic and not to scale)

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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 of the output voltage is : (Graphs drawn are schematic and not to scale)Physics Question Image

JEE MainJEE Main 2020Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

As there are two zener diodes in reverse polarity so if one is in forward bias the other will be in reverse bias and above $6 V$ the reverse bias will too be in conduction mode. Therefore when voltage is more than $6 V$ the output will be constant. And when it is less than $6 V$ it will follow the input voltage so correct answer is two.