This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Direct Method”.
1. What is the full form of ASCII?
a) American Standard Character for Information Interchange
b) American Standard Class for Information Interchange
c) American Standard Code for Information Interchange
d) Alphanumeric Standard Code for Information Interchange
Explanation: ASCII is the most common format for text files in computers. In an ASCII file each symbol is represented by a 7 bit binary number. In this 128 possible characters are defined.
2. The transmitter and receiver are not synchronized at all, in asynchronous transmission.
Explanation: In Asynchronous transmission, each character is signified by start and stop bits. Thus, the transmitter and receiver are synchronized frame-by-frame using the start and stop bits, not by data bits.
3. In synchronous transmission, receiver is able to sync with the transmitter by using ________
a) Clock bits
b) Start and Stop bits
c) CRC bits
d) Data bits
Explanation: In synchronous transmission both sender and receiver access the data according to same clock. It has no start and stop bits and thus it has more efficient. Receiver and transmitter are in sync with each other by using data bits.
4. FEC stands for _________
a) Forward Error Correction
b) Fixed Error Correction
c) Forward Error Communication
d) Fixed Error Communication
Explanation: FEC is a method of obtaining error control in data transmission. It stands for Forward Error Correction.
5. Run-length encoding is used to ________
a) correct data
b) segregate data
c) encrypt data
d) compress data
Explanation: Run length encoding is a very simple form of lossless data compression in which runs of data are stored as a single value data, rather than as original run.
6. The term CD in CSMA/CD stands for _________
a) Collision Detection
b) Collision Delay
c) Compact Detection
d) Compact Delay
Explanation: CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection. It is mostly used in early Ethernet technology for local area networking.
7. Dumb terminals are used in token-passing networks.
Explanation: A dumb terminal is an output that accepts data from CPU. It has no processing capabilities. Dumb terminals are used in networks that require central monitoring. Thus, dumb terminals are used for token-passing networks. However, smart terminals to exist which has its own processor.
8. In networks, long messages are divided into “chunks” called __________
Explanation: For any long message to be transmitted, it is first divided into many small parts called packets. Individual packets belonging to a long message may arrive out of order at the destination.
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