Question

Why amplification of a signal is necessary in a communication system?
1. to compensate for the attenuation
2. to increase the bandwidth 
3. to remove noise from signal
4. to increase the range of signal

Answer 1

Correct Answer - Option 1 : to compensate for the attenuation

CONCEPT:

• Amplification: It is the process of increasing the amplitude and strength of an electrical signal with the help of an amplifier usually a transistor amplifier. Amplification is important to compensate for the loss of strength during its transmission across the channel. It is done at the point in the channel where the strength of the signal becomes weakened. 
• Attenuation: It is the loss of strength of a signal during its transmission across the communication channel.

EXPLANATION: 

• During transmission of signals, the strength of the signal becomes weak and in that case, amplification is required to compensate for this loss of strength or attenuation.
• The correct answer is option (1)