What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?

Answer: A. 4:1

For a resistive load, SWR is the larger impedance divided by the smaller: 200 / 50 = 4, so 4:1. SWR is always written with the larger number first.

Tip: SWR = big ohms / small ohms.