Advanced Qualification · A-004 Power supplies · A-004-003-001
What is one characteristic of a linear electronic voltage regulator?
- A The conduction of a control element is varied in direct proportion to the line voltage or load current
- B It has a ramp voltage at its output
- C A pass transistor switches from its "on" state to its "off" state
- D The control device is switched on or off, with the duty cycle proportional to the line or load conditions
Correct answer: A — The conduction of a control element is varied in direct proportion to the line voltage or load current. From the official ISED question bank, verified word for word.
Why
A linear regulator works like a smart valve that constantly adjusts how much it opens to keep the output steady, meaning the conduction of its control element changes in direct proportion to shifts in line voltage or load current. 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.