Advanced Qualification · A-004 Power supplies · A-004-003-003
What device is typically used as a stable reference voltage in a linear voltage regulator?
- AAn SCR
- BA varactor diode
- CA junction diode
- DA Zener diode
Correct answer: D — A Zener diode. From the official ISED question bank, verified word for word.
Why
A Zener diode is the right choice because it is designed to maintain a steady voltage across its terminals even when the current flowing through it changes, making it perfect as a stable reference point inside a linear voltage regulator. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies is section A-004 of the Advanced exam: Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.
Drill A-004 — free, no account