Communication Systems

A transducer is a device that converts one form of energy into another. In communication systems, transducers are used to convert energy from electrical to mechanical, sound, or light forms, depending on the application. For example, microphones and speakers are transducers that convert sound energy to electrical energy and vice versa.

A repeater amplifies or regenerates signals to extend their range, but does not convert energy from one form to another.
An amplifier increases the amplitude of a signal but does not convert energy from one form to another.
An attenuator reduces the strength of a signal but does not involve conversion of energy forms.
An antenna transmits or receives electromagnetic waves but does not convert energy from one form to another.

The correct option is (B) : transducer

Given:

• Line-of-sight communication methods.

Step 1: Identify Correct Wave Type

Line-of-sight communication uses space waves, which travel directly from transmitter to receiver (e.g., TV, FM radio, satellite signals).

Conclusion:

The correct answer is (D) Space wave.