Basic Qualification · B-008 Interference and suppression · B-008-005-002
A filter attenuates frequencies below its cut-off frequency of 60 MHz. What type of filter is it?
- A Low-pass
- B Band-pass
- C Notch
- D High-pass
Correct answer: D — High-pass. From the official ISED question bank, verified word for word.
Why
A High-pass filter is correct because it blocks or weakens signals below a set point while letting higher frequencies pass through. The full explanation — and one for every question — is in Pro.
Practise this section
When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.