Extra exam question E9F02
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9F
Which of the following has the biggest effect on the velocity factor of a transmission line?
- A.The characteristic impedance
- B.The transmission line length
- C.The insulating dielectric material (correct answer)
- D.The center conductor resistivity
WhyThe insulating dielectric material has the biggest effect on a transmission line's velocity factor. The insulating dielectric material between a transmission line's conductors has the biggest effect on its velocity factor, since the dielectric constant of that material directly determines how much it slows electromagnetic waves compared to their speed in a vacuum, answer C. Characteristic impedance, line length, and center conductor resistivity don't have nearly as direct an effect on velocity factor as the dielectric material itself does.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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