Draw a neat and labelled block diagram of a receiver.

A receiver is one of the important parts of the communication system. A receiver is a device that chooses a signal from a communication channels many signals, recovers the baseband signal, and sends it to the user. It receives the message signal at the channel output, reconstructs it in recognisable form of the original message for delivering it to the user of information. It amplifies the signal and then mixes it with the signal from the local oscillator and filters for the baseband signal and then demodulates, and the signal is given to the user. The block diagram of the receiver is shown above. It consists of amplifier, mixer, filter and demodulator and also a local oscillator.

Explain the term attenuation in communication system.

The signal while propagating from one medium to another, there are always associated with losses of its strength. This loss in the signal strength is called attenuation. Attenuation should be reduced to prevent loss of signal. One of the processes to reduce attenuation is amplification.

Explain the term transducer in communication system.

The transducer is a device that converts one form of energy into another form. In context to a communication system, An electric transducer may be defined as a device that converts some physical variables (pressure, displacement, force, etc) into corresponding variations in the electrical signal at its output. For example- LED, Microphone, speaker etc.