Advantages of automatic gain control and AM Wave

Automatic gain control

a.) Provides controlled signal amplitude at the output
b.) Adjusts the input to output gain to a suitable value
c.) Is used in AM radio receiver
d.) All of the above

Correct Answer: d) All of the above

Explanation:

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 so that the system may work properly even for wide range of variations at the input.

The AGC is used in AM radio receivers for controlling the weak and strong sound signals.

In an Amplitude Modulation

a.) Amplitude of the carrier varies
b.) Frequency of the carrier remains constant
c.) Phase of the carrier remains constant
d.) All of the above

Correct Answer: d) all of the above

Explanation:

In an Amplitude Modulation, the amplitude of the carrier varies according to the instantaneous values of the baseband signal. The frequency and the phase of the carrier remain constant.

The envelope of the AM wave has the same shape as the message of the base band signal.