Question

In automatic gain control of the AM receiver ________

(a) gain of the receiver is adjusted

(b) gain adjustment depends upon the strength of received signal

(c) is an open-loop system

(d) gain is received only by stronger signals

This question was posed to me by my college professor while I was bunking the class.

My question is taken from Amplitude Limiting topic in division Receivers & Transducers of Analog Communications

Answer 1

Correct answer is (a) gain of the receiver is adjusted

To explain I would say: Automatic Gain Control provides controlled signal amplitude at the output even if there are amplitude variations at the input. This controlled output adjusts the input to output gain to a suitable value.