Question

Which of the following statement is false?

(a) Modulation is used to reduce the bandwidth

(b) Modulation is used to separate different transmissions

(c) Modulation is used to allow the use of practical antennas

(d) Modulation is used to ensure that wave is transmitted over long distances

The question was asked in my homework.

My query is from Noise in AM in portion Noise of Analog Communications

Answer 1

Right option is (a) Modulation is used to reduce the bandwidth

To explain I would say: Modulation is the process of varying one or more properties of a periodic waveform that contains the information to be transmitted. It is used to separate different transmission signal so they do not get mixed, it ensure that the wave travels a long distance. But it is not used to reduce bandwidth.