Transmission Medium Or Communication Channel

Which of the following is not a transmission media used in communication system ?

A 1 KW signal is transmitted using a communication channel which provides attenuatiom at the rate of - 2 dB per km . If the communication channel has a total length of 5 km , the power of the signal received is [ gain in dB = 10 log ((P_(0))/(P_(i)))]

Five distinct letters are to be transmitted through a communication channel.A tota number of 15 blanks is to be inserted between the two letters with at least three between every two.The number of ways in which this can be done is

What is a transmission mediem? What are the various transmission media used to communication system?

In communication system, type of communication channel needed for given signal depends on

Communication channel consist of:

A local post office is to send M telegrams which are distributed at random over N communication channels,(N>M). Each telegram is sent over any channel with equal probrability.Chance that not more than one telegram will be sent over each channel is:

is the set up used in the transimiision of information from one place to another. The present day communication systems are electrical, electronic or optical in nature. Three parts of a communication system are: Transmitter: Communication Channer and Receiver. A signal is defined as a single valued function of time. This function has a unique value at every instant of time. Most of the speech or information signals cannot be transmitted directly over long distances. They have to be modulated suitably and then trasmitted. Communication channer carries the modulated wave from transmitter to receiver. The air, transmission lines and free space are the common communication channels. the reciever consisits of a pickup antenna, a with the help of the above passage, choose the most appropriate alternative to each of the following questions: Communication systems may be