General exam question G7B10
Subelement G7, PRACTICAL CIRCUITS· Group G7B
Which of the following describes a linear amplifier?
- A.Any RF power amplifier used in conjunction with an amateur transceiver
- B.An amplifier in which the output preserves the input waveform (correct answer)
- C.A Class C high efficiency amplifier
- D.An amplifier used as a frequency multiplier
WhyA linear amplifier is an amplifier in which the output preserves the input waveform. A linear amplifier is defined by faithfully reproducing the shape of its input waveform at a larger amplitude at its output, preserving the original signal's information rather than distorting or reshaping it, answer B. Not every RF amplifier used with a transceiver qualifies as linear (a Class C stage, for instance, deliberately distorts the waveform), and a frequency multiplier intentionally changes the waveform's frequency content, so A, C, and D don't fit the definition.
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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