General exam question G5A10
Subelement G5, ELECTRICAL PRINCIPLES· Group G5A
Which of the following devices can be used for impedance matching at radio frequencies?
- A.A transformer
- B.A Pi-network
- C.A length of transmission line
- D.All these choices are correct (correct answer)
WhyA transformer, a Pi-network, and a length of transmission line can all be used for impedance matching at radio frequencies. A transformer, a Pi-network, and even a properly chosen length of transmission line (as a quarter-wave transformer) can all be used to transform one impedance into another at radio frequencies, so all of these answer the question, answer D. Since each of A, B, and C is individually a legitimate impedance-matching technique, the complete answer has to include all three.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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