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Zener diode is operated in:

AForward bias only
BAlways off
CBoth
DREVERSE bias (uses Zener breakdown for voltage regulation)
Answer & Solution
Correct answer: D. REVERSE bias (uses Zener breakdown for voltage regulation)
**Zener:** heavily doped p-n junction designed to operate in reverse breakdown without damage. Maintains nearly constant voltage across it. Used as voltage regulator.
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