Q113 / 150 · MHT CET 2026 (13 April Shift 2) · Physics
Choose the correct statement about Zener diode:
- Correct answerAIt works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.
- BIt works as a voltage regulator in both forward and reverse bias.
- CIt works a voltage regulator only in forward bias.
- DIt works as a voltage regulator in forward bias and behaves like simple pn junction diode in reverse bias.
Solution
A Zener diode is a heavily doped p-n junction diode designed to operate in the reverse breakdown region.
In reverse bias, when the applied voltage reaches the Zener breakdown voltage, the voltage across the diode remains constant for a wide range of currents. This property allows it to be used as a voltage regulator.
In forward bias, a Zener diode behaves exactly like a standard p-n junction diode, allowing current to flow when the forward voltage exceeds the barrier potential.
Answer: It works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.
In reverse bias, when the applied voltage reaches the Zener breakdown voltage, the voltage across the diode remains constant for a wide range of currents. This property allows it to be used as a voltage regulator.
In forward bias, a Zener diode behaves exactly like a standard p-n junction diode, allowing current to flow when the forward voltage exceeds the barrier potential.
Answer: It works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.
Hence, the correct answer is option: 'A'.