Question

Standing wave ratio is defined as the

(a) Ratio of voltage maxima to voltage minima

(b) Ratio of current maxima to current minima

(c) Product of voltage maxima and voltage minima

(d) Product of current maxima and current minima

The question was asked in an internship interview.

The origin of the question is Standing Waves and SWR topic in section Transmission Lines of Electromagnetic Theory

Answer 1

Right answer is (a) Ratio of voltage maxima to voltage minima

For explanation: SWR is defined as the ratio of the partial standing wave’s amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line. It is given by S = VMAX/VMIN.