With reference to digital communication, which of the following statements are…
2024
With reference to digital communication, which of the following statements 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:
Answer: D. B, C and D Only — ConceptData transmission modes are classified by the direction and simultaneity of data flow. In simplex mode, data moves in one direction only; in…
- A.
A and B Only
- B.
B and C Only
- C.
A and C Only
- D.
B, C and D Only
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Correct answer: D
Concept
Data transmission modes are classified by the direction and simultaneity of data flow.
In simplex mode, data moves in one direction only; in half-duplex mode, both ends can transmit but not at the same time; in full-duplex mode, both ends can transmit simultaneously. These names describe flow direction, not whether communication is automatic.
Application
Radio broadcasting sends information from the station to receivers in one direction, so it is simplex; automatic is not the relevant transmission-mode category.
Keyboard input travels from the keyboard to the computer, which is a standard simplex example.
Walkie-talkies allow both users to speak, but they take turns, so they operate in half-duplex mode.
Telephone calls allow both participants to speak and hear simultaneously, which is full-duplex.
Cross-check
Classifying each example by who can transmit and whether transmission can occur simultaneously yields false, true, true, true for the radio, keyboard, walkie-talkie, and telephone statements respectively.
Therefore, the true statements are B, C and D only.