1. Which of the following is NOT a mode of digital communication?
A. Broadcasting
B. Point-to-point communication
C. Satellite communication
D. Telecommunication
2. Which of the following is an example of an analog information source?
A. Computer data
B. Text
C. Speech signal
D. Binary code
3. Which process involves sampling, quantization, and encoding?
A. Source encoding
B. Channel encoding
C. Formatting
D. Modulation
4. Asynchronous transmission is best suited for which of the following?
A. High-speed communication
B. Low-speed communication
C. Real-time audio and video
D. Large data block
5. Which error correction method involves the receiver guessing the message using redundant bits?
A. Forward error correction
B. Retransmission
C. Parity check
D. Checksum
6. What is a key characteristic of synchronous transmission?
A. Arbitrary delay between data items
B. Continuous data flow without gaps
C. Fixed intervals between data items
D. Use of start and stop bits
Answer (2)
The detailed answers indicate that telecommunication is not a mode of digital communication, while speech signals serve as an analog information source. Additionally, asynchronous transmission suits low-speed communication. Forward error correction aids in error correction by using redundant bits, and synchronous transmission features fixed intervals between data items.
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The mode of digital communication that is NOT included is A. Broadcasting . Broadcasting is a method of sending a message to a wide audience all at once, typically used in analog communication. Point-to-point, satellite communication, and telecommunication all fall under digital communication types.
An example of an analog information source is C. Speech signal . Analog sources are continuous signals, like voice, in contrast to digital sources, which are discrete, like binary code or computer data.
The process that involves sampling, quantization, and encoding is A. Source encoding . Source encoding converts an analog signal to a digital signal by first sampling the signal at regular intervals, quantizing the sample values, and then encoding these values into a digital format.
Asynchronous transmission is best suited for B. Low-speed communication . In asynchronous transmission, data is sent one byte at a time with start and stop bits, making it suitable for low-speed data transmission.
The error correction method that involves the receiver guessing the message using redundant bits is A. Forward error correction . This technique uses additional (redundant) bits to allow the receiver to detect and correct errors without needing a retransmission.
A key characteristic of synchronous transmission is B. Continuous data flow without gaps . In synchronous transmission, data is sent in a continuous stream with clocks that help to synchronize the transmission.
