Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-006
What causes a transmission line to be unbalanced?
- AThe conductors are twisted together
- BOne conductor has a poor connection the antenna
- CThe conductors have deteriorated insulation
- DOne conductor is connected to ground
Correct answer: D — One conductor is connected to ground. From the official ISED question bank, verified word for word.
Why
A transmission line becomes unbalanced when one of its two conductors is tied to ground, creating an asymmetry where the currents flowing in each wire are no longer equal and opposite. 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