General exam question G7B11
Subelement G7, PRACTICAL CIRCUITS· Group G7B
For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?
- A.SSB
- B.FM (correct answer)
- C.AM
- D.All these choices are correct
WhyA Class C power stage is appropriate for amplifying an FM modulated signal. FM's information is carried entirely in the signal's frequency, not its amplitude, so a Class C stage's nonlinear, amplitude-distorting operation doesn't corrupt the modulation, making Class C well suited to amplifying an FM signal, answer B. SSB and AM both carry information in the signal's amplitude envelope, which a nonlinear Class C stage would distort and destroy, so neither of those modes, and therefore not "all of these," works with Class C amplification.
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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