Basic Qualification · B-008 Interference and suppression · B-008-005-006
You need to install an AC line filter to reduce radio frequency noise heard in your station equipment. What type of frequency response should it have?
- AHigh-pass
- BBand-pass
- CBand-reject
- DLow-pass
Correct answer: D — Low-pass. From the official ISED question bank, verified word for word.
Why
A Low-pass filter is the right choice because it lets your normal 50 or 60 hertz power frequency pass through to your equipment while blocking the much higher radio frequency noise that causes interference. The full explanation — and one for every question — is in Pro.
Practise this section
Interference and suppression is section B-008 of the Basic exam: When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.
Drill B-008 — free, no account