Question

In a communication system, noise is most likely to affect the signal
A) At the transmitter
B) In the medium of transmission
C) In the formation of the source signal
D) At the destination

Answer 1

In the communication system noise is unwanted modifications for which signal may be affected during transmission, processing, or conversion.

Complete step by step solution:
Noise is an error or undesired random disturbance of an information signal. The noise is an addition of disturbing energy from natural and sometimes human-made sources.
Here we go through the given options and find the correct answer for that In a
communication system, where the noise is most likely to affect the signal –
- Noise is not most likely to affect the signal at the transmitter because the noise is created by the signal transmitter itself and it is transmitted with the whole signal frequency. So option (A) is not the right option.
- Noise is an unwanted as well as a disturbing signal which interferes with the main signal and corrupts the parameters of the signal. It is most likely to be entered at the channel and therefore affects the signal in the transmission line. So option (B) is the right option.
- Noise is not most likely to affect the signal In the formation of the source signal because it is added to the source signal during transmission. So option ( C ) is not the right option.
- In a communication system noise does not much affect the signal at the destination than the transmission line. So option (D) is not the right option.

Hence option (B) is the only correct option.

Note:
There are many types of noises. Among them, the well-known noises are named electronic noise, thermal noise, intermodulation noise, cross-talk, impulse noise, shot noise, and transit-time noise, etc.
Classification of Noise: Noise may be put into the following two categories:
- External noises whose sources are external.
- Internal noises whose noise sources are generated internally by the circuit or the communication system.