With reference to digital communication, which of the following statements A-D are true?

A. A Radio broadcast is an example of automatic type of transmission mode.

B. A Keyboard communicating with a computer is an example of simplex type of transmission mode.

C. Walkie-Talkies operate on half-duplex transmission mode.

D. Telephone calls are an example of full duplex transmission mode.

Choose the most appropriate answer from the options given below:

Correct option is D

• B. Keyboard communicating with a computer operates in simplex mode, where data flows in one direction from the keyboard to the computer.
• C. Walkie-Talkies use half-duplex transmission mode, which allows for two-way communication but only one direction at a time.
• D. Telephone calls function in full-duplex mode, meaning both parties can talk and listen simultaneously.

Information Booster:

1. Simplex transmission is one-way communication where signals are sent in a single direction only.
2. Half-duplex transmission allows signals to flow in both directions, but not simultaneously.
3. Full-duplex transmission enables two-way communication where both parties can send and receive signals at the same time.
4. Radio broadcasts typically use simplex mode, but not automatic transmission. Radio waves are sent in one direction to a wide audience, which is not the same as automatic transmission.
5. Walkie-Talkies require pressing a button to switch between sending and receiving, which is characteristic of a half-duplex system.
6. Telephone calls allow continuous two-way communication, as both parties can speak and listen at the same time, distinguishing them as a full-duplex system.

Additional Knowledge:

• A. A Radio broadcast uses simplex transmission, not automatic. It broadcasts signals in one direction, from the station to the audience.