Basic Qualification · B-008 Interference and suppression · B-008-005-011
A filter attenuates frequencies above its cut-off frequency of 40 MHz. What type of filter is it?
- ANotch
- BLow-pass
- CBand-pass
- DHigh-pass
Correct answer: B — Low-pass. From the official ISED question bank, verified word for word.
Why
A low-pass filter lets signals below a set limit pass through while blocking those above it. 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