Question
In a Zener diode :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Sharp breakdown occurs at low reverse voltage
Zener Diode Key Characteristics
A Zener diode is a special type of diode designed to operate reliably in the reverse breakdown region.
Understanding Zener Breakdown
- Unlike standard diodes which are damaged by reverse breakdown, Zener diodes are specifically designed to withstand it.
- This sharp breakdown occurs at a precisely defined reverse voltage, known as the Zener voltage ($V_Z$).
- Above this voltage, the current increases sharply with a very small increase in voltage, exhibiting a near-constant voltage characteristic.
- This property makes Zener diodes ideal for voltage regulation applications.
Evaluating Other Options
- Option 1 is incorrect; Zener diodes typically have a lower forward voltage drop than standard diodes.
- Option 3 is incorrect; while some devices exhibit negative resistance, it's not the primary defining characteristic of a Zener diode in its standard operating mode. The breakdown region is characterized by a *positive* resistance, albeit a low one.
- Option 4 is incorrect; a sharp breakdown is the defining feature.
Therefore, the most accurate description of a Zener diode is its ability to exhibit a sharp breakdown at a low reverse voltage.
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