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Electronic Devices question

2023 · 1 Feb · Shift 2 · Q56
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Electronic Devices question

2023 · 1 Feb · Shift 2 · Q56

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
Choose the correct statement about Zener diode :
  1. A
    It works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.
  2. B
    It works as a voltage regulator in both forward and reverse bias.
  3. C
    It works as a voltage regulator only in forward bias.
  4. D
    It works as a voltage regulator in forward bias and behaves like simple pn junction diode in reverse bias.
View written solutionFree

Correct answer: A

  1. Recall the behavior of a Zener diode

    A Zener diode is a specially designed pnpnpn junction diode meant to operate safely in the reverse breakdown region.

  2. Behavior in forward bias

    In forward bias, a Zener diode behaves like an ordinary pnpnpn junction diode.

    • It starts conducting after the forward threshold is crossed.
    • So in forward bias, it is essentially like a simple diode.

  3. Behavior in reverse bias

    In reverse bias, once the reverse voltage reaches the Zener breakdown voltage VZV_ZVZ​, the diode conducts heavily while maintaining nearly constant voltage across it.

    Hence, it is used as a voltage regulator in reverse bias.

  4. Check each option

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

    • This is exactly the correct property of a Zener diode.
    • Correct

    B: It works as a voltage regulator in both forward and reverse bias.

    • In forward bias, it does not serve as a voltage regulator in the usual sense.
    • Incorrect

    C: It works as a voltage regulator only in forward bias.

    • Opposite of the actual behavior.
    • Incorrect

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

    • Reverse statement of the truth.
    • Incorrect

  5. Final answer

    The correct option is: A\boxed{A}A​

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