Advanced Qualification · A-007 Feedlines and matching · A-007-002-005
What is the velocity factor of a transmission line?
- A The velocity of the wave on the transmission line multiplied by the velocity of light in a vacuum
- B The index of shielding for coaxial cable
- C The ratio of the characteristic impedance of the line to the terminating impedance
- D The velocity of the wave on the transmission line divided by the velocity of light
Correct answer: D — The velocity of the wave on the transmission line divided by the velocity of light. From the official ISED question bank, verified word for word.
Why
The velocity factor is simply a ratio that tells you how fast a radio wave travels inside a cable compared to how fast it moves through empty space. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.