Basic Qualification · B-003 Station assembly, practice and safety · B-003-017-004
Compared to a switching (switch mode) power supply, why may a linear power supply be preferred?
- AHigher efficiency
- BBetter regulation for FM equipment
- CLower risk of radio frequency noise
- DReduced physical dimensions and weight
Correct answer: C — Lower risk of radio frequency noise. From the official ISED question bank, verified word for word.
Why
Linear power supplies use a heavy transformer to step down voltage smoothly, avoiding the rapid on-off switching that creates electrical sparks and interference. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account