Question

Find the standing wave ratio, when a load impedance of 250 ohm is connected to a 75 ohm line.

(a) 0.3

(b) 75

(c) 250

(d) 3.33

I have been asked this question in class test.

This interesting question is from Standing Waves and SWR topic in chapter Transmission Lines of Electromagnetic Theory

Answer 1

Right option is (d) 3.33

To explain I would say: The standing wave ratio is the ratio of the load impedance to the characteristic impedance. Thus S = ZL/Zo. On substituting for ZL = 250 and Zo = 75, we get S = 250/75 = 3.33.