Discussion
Which statement about the direct-current component at a diode detector's output is correct?
Answer: D
The rectified carrier appears as a direct-current level proportional to the received carrier strength, which is exactly the signal the automatic gain control loop needs. It is therefore extracted deliberately rather than blocked, while a coupling capacitor removes it from the audio path. It does not depend on the index, which sets the alternating component. And a balanced detector for AM is not the arrangement in use; balance belongs to the modulator.
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