General exam question G7B01
Subelement G7, PRACTICAL CIRCUITS· Group G7B
What is the purpose of neutralizing an amplifier?
- A.To limit the modulation index
- B.To eliminate self-oscillations (correct answer)
- C.To cut off the final amplifier during standby periods
- D.To keep the carrier on frequency
WhyNeutralizing an amplifier eliminates self-oscillations. Neutralizing an RF power amplifier feeds a small out-of-phase signal back to cancel unwanted feedback through the active device's internal capacitance, which is exactly what stops the stage from breaking into unwanted self-oscillation, answer B. It isn't about limiting modulation index, isn't how a final amplifier is cut off during standby (that's keying or muting), and isn't a frequency-stability technique for the carrier, so A, C, and D are wrong.
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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