Advanced Qualification · A-007 Feedlines and matching · A-007-005-006
Which of the following is NOT a valid parabolic dish illumination arrangement?
- A Offset feed
- B Cassegrain
- C Newtonian
- D Front feed
Correct answer: C — Newtonian. From the official ISED question bank, verified word for word.
Why
Newtonian is the right choice because it describes a telescope design for visible light, not a method for feeding radio waves to a parabolic dish antenna. 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.