Test Index

MHTCET 13 Apr 2026 Shift 2 Paper

Question : 50 of 150

Marks: +1, -0

Choose the correct statement about Zener diode:

It works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.
It works as a voltage regulator in both forward and reverse bias.
It works a voltage regulator only in forward bias.
It works as a voltage regulator in forward bias and behaves like simple pn junction diode in reverse bias.

Solution:

Concept:

A Zener diode regulates voltage in reverse bias and acts as an ordinary diode in forward bias.

Explanation:

A Zener diode is specially designed to operate in the breakdown region under reverse bias.

When the reverse voltage reaches the Zener voltage

V_Z

, the diode conducts heavily, but the voltage across it remains almost constant.

This constant voltage property makes it a voltage regulator in reverse bias.

In forward bias, it behaves like a simple

p n

junction diode.

It starts conducting after the usual threshold voltage, about

0.7\ \mathrm{V}

for silicon.

Hence, the correct statement is that it works as a voltage regulator in reverse bias and behaves like a simple

p n

junction diode in forward bias.

Answer:

Option A

Go to Question:

Prev Question

Next Question