Advanced Qualification · A-004 Power supplies · A-004-003-002
What is one characteristic of a switching voltage regulator?
- AThe conduction of a control element is varied in direct proportion to the line voltage or load current
- BIt provides more than one output voltage
- CIt gives a ramp voltage at its output
- DThe control device is switched on and with the duty cycle proportional to the line or load conditions
Correct answer: D — The control device is switched on and with the duty cycle proportional to the line or load conditions. From the official ISED question bank, verified word for word.
Why
A switching regulator works by rapidly turning its control device on and off, adjusting how long it stays on (the duty cycle) to match changes in line voltage or load current. 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