Zener diode is operated in:
AREVERSE breakdown region (used for voltage reference)
BJust on
CForward only
DRandom
Answer & Solution
Correct answer: A. REVERSE breakdown region (used for voltage reference)
Zener: heavily doped p-n junction; sharp breakdown at specified V_Z (typically 3-50 V). Operated in reverse breakdown. Voltage stays nearly constant despite large current changes → ideal voltage reference. Used in voltage regulators, surge protection.
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