Discussion
What does a receiver's automatic gain control protect against?
Answer: B
The loop holds the detector's input roughly constant, preventing overload and distortion when a strong station is tuned in while allowing full gain on weak ones. Drift is a frequency matter. Image interference is a filtering matter. And harmonic radiation is the transmitter's problem entirely. Each protective mechanism in a receiver addresses one specific failure, and naming that failure is the quickest route to the answer.
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