Advanced Qualification · A-004 Power supplies · A-004-003-009
What type of voltage regulator contains a voltage reference, error amplifier, sensing resistors and transistors, and a pass element in one package?
- A A Zener regulator
- B A three-terminal regulator
- C An op-amp regulator
- D A switching regulator
Correct answer: B — A three-terminal regulator. From the official ISED question bank, verified word for word.
Why
A three-terminal regulator packs a voltage reference, error amplifier, sensing resistors, transistors, and a pass element into a single, convenient package with just input, output, and ground connections. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.