Advanced Qualification · A-007 Feedlines and matching · A-007-002-007
What is a typical velocity factor for coaxial cable with polyethylene dielectric?
- A0.1
- B2.7
- C0.66
- D0.33
Correct answer: C — 0.66. From the official ISED question bank, verified word for word.
Why
Signals travel slower in coaxial cable than in empty space because the plastic insulation, called the dielectric, slows the wave down. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
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