Discussion
Which impairment does a limiter fail to remove from an AM signal?
Answer: A
A limiter removes amplitude variation indiscriminately, and in AM the amplitude variation is the information, so limiting destroys the message. That is why limiters belong to FM receivers, where amplitude carries nothing and removing it strips the noise. The three impairments listed as alternatives are all amplitude effects a limiter would indeed suppress, along with the signal itself, which is precisely why it cannot be used here.
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