Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-001
What kind of transmission line has a centre wire inside an insulating material that is covered by a metal shield or sleeve?
- AWindow line
- BOpen-wire line
- CWaveguide
- DCoaxial cable
Correct answer: D — Coaxial cable. From the official ISED question bank, verified word for word.
Why
Coaxial cable fits the description because it has a single centre wire surrounded by insulation and then enclosed by a metal shield that acts as the second conductor. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account