Advanced Qualification · A-007 Feedlines and matching · A-007-002-008
What determines the velocity factor in a transmission line?
- A The centre conductor resistivity
- B The terminal impedance
- C Dielectrics in the line
- D The line length
Correct answer: C — Dielectrics in the line. From the official ISED question bank, verified word for word.
Why
The speed at which a radio signal travels down a cable depends on the insulating material, or dielectric, that sits between the wires. 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.