Mention the function of any two of the following used in communication system :
(i) Transducer
(ii) Repeater
(iii) Transmitter
(iv) Bandpass Filter

Explanation

### Step-by-Step Solution:

1. **Transducer**: A transducer is a device that converts one form of energy into another. In communication systems, transducers are essential because they allow the conversion of signals from one medium to another. For example, a microphone converts sound waves (acoustic energy) into electrical signals, while a speaker converts electrical signals back into sound waves.

2. **Repeater**: A repeater is a device that receives a signal and retransmits it to extend the range of communication. It effectively combines the functions of a transmitter and a receiver. Repeaters are crucial in communication systems, especially for long-distance transmission, as they help to amplify and regenerate the signal, ensuring that it maintains its integrity over long distances.

### Summary of Functions:
- **Transducer**: Converts one form of energy into another (e.g., sound to electrical signals).
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