Basic Qualification · B-003 Station assembly, practice and safety · B-003-008-004
What is the purpose of the filter in a linear power supply?
- A Ensure that the voltage stays constant when a heavy demand is placed on the supply
- B Absorb the power produced by the supply
- C Smooth out pulsating direct current
- D Convert alternating current into direct current
Correct answer: C — Smooth out pulsating direct current. From the official ISED question bank, verified word for word.
Why
A linear power supply first turns alternating current into direct current, but this new current still pulses on and off like a heartbeat. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.