This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Direct Method”.
1. Which of the following devices is used to generate AM waves?
b) Square law modulator
Explanation: AM signals is generated by Square-law modulators. The input for generating AM signal should be of type (A + m(t)) instead of m(t). Square-law modulator sums carrier and information signal, then square them using a non linear device.
2. 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.
3. The transmitter and receiver are not synchronized at all, in asynchronous transmission.
Explanation: In Asynchronous transmission, transmitter and receiver are synchronized frame-by-frame using the start and stop bits.
4. In synchronous transmission, receiver is able to sync with the transmitter by using ________
a) Clock bits
b) Separate clock line
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.
5. Which chart is used for calculations of transmission lines?
a) Andre chart
b) Smith chart
c) Wilson chart
d) Federer chart
Explanation: Smith chart is highly used in radio frequency engineering. Because it is highly useful in solving problems related with transmission lines and matching circuits. It is highly useful for displaying multiple parameters like impedance, admittance etc simultaneously.
6. FEC stands for _________
a) Forward Error Correction
b) Fixed Error Correction
c) Forward Error Control
d) Fixed Error Control
Explanation: FEC is a method of obtaining error control in data transmission. It stands for Forward Error Correction.
7. Run-length encoding is used to ________
a) correct data
b) reduce the length
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.
8. The term CD in CSMA/CD stands for _________
a) Collision Detection
b) Collision Delay
c) Carrier Detection
d) Carrier 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.
9. 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 requires central monitoring.
10. 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.
Sanfoundry Global Education & Learning Series – Analog Communications.
To practice all areas of Analog Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.