Basic Qualification · B-006 Feedlines and antenna systems · B-006-006-004
If both source and load impedances are purely resistive, what value of load impedance will result in maximum power delivery to the load?
- A Load impedance equal to half of the source impedance
- B Load impedance equal to twice the source impedance
- C Load impedance equal to the square root of source impedance
- D Load impedance equal to the source impedance
Correct answer: D — Load impedance equal to the source impedance. From the official ISED question bank, verified word for word.
Why
When both the source and the load are purely resistive, maximum power reaches the antenna only when their resistance values match exactly. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.