Question

Choose the correct statement about Zener diode:

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

Hint:

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

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A Zener diode is a heavily doped p-n junction designed to work in reverse breakdown, where the voltage across it stays nearly constant over a wide range of current.

Step 2: Check each:
In reverse bias it acts as a voltage regulator. In forward bias it conducts like a normal p-n diode.
B and C say it regulates in forward bias, which is wrong, since a forward diode has a drop of only about \(0.7\) V and no sharp breakdown. D reverses the roles, so it is wrong too.

Final Answer:
A Zener diode regulates in reverse bias and acts as a normal diode in forward bias, option (A). \[ \boxed{\text{Option (A)}} \]