This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Transmission Bandwidth”.
1. What is the full form of DTMF?
a) Dual-Tone Multi frequency
b) Digital Telephony Multiple Frequency
c) Dual-Tone Master Frequency
d) Digital Tone Multiple Frequency
Explanation: DTMF is an in-band telecommunication signal. It uses the voice-frequency band over telephone lines. It was developed by Bell Systems in United States.
2. If we see practically, parallel data transmission is sent ________
a) usually over long distances
b) over short distances only
c) usually over a coaxial cable
d) over any distance
Explanation: In serial transmission, bits are transmitted one at a time over a single channel. In parallel transmission bits are sent simultaneously over their own individual channel. It sent data over short distances only.
3. Who invented the five-level teletype code?
a) Teletype company
b) Morkum company
c) Western Union
d) Emile Baudot
Explanation: Emile Baudot invented the five-level teletype code. Each character in alphabet is represented by a series of five bits.
4. What is the full form of LATA?
a) Local Access Telephone Area
b) Local Area Telephone Access
c) Local Access and Transport Area
d) Local Area Transport Access
Explanation: LATA is term in the U.S. for a geographical area covered by one or more local telephone companies. It is legally referred to as local exchange carriers.
5. The transmitter and receiver are frame-by-frame synchronized using the data bits in asynchronous transmission.
Explanation: In Asynchronous transmission, transmitter and receiver are synchronized frame-by-frame using the start and stop bits, not by data bits.
6. Why synchronous transmission is more preferred?
a) it has no start and stop bits
b) it is cheaper than asynchronous
c) it is easier to implement
d) less complex
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.
7. In frequency modulation, there is a large increase in noise and hence decrease in the signal to noise ratio.
Explanation: In frequency modulation, there is a large decrease in noise and hence increase in the signal to noise ratio.
8. The output of a battery eliminator is closed to ________
a) 70V DC
b) 70V AC
c) 6V AC
d) 6V DC
9. Which statement is true about HDLC?
a) it is an IBM product
b) it is a bit-oriented protocol
c) it is identical to SDLC
d) it is non-identical to SDLC
Explanation: HDLC is a high-level data link control. It is a bit-oriented protocol. HDLC is group of rules for transmitting data between network points.
10. What is the use of ARQ?
a) correct bit errors
b) put data in a temporary buffer
c) correct synchronization problems
d) make data bits simpler
Explanation: ARQ is an error control method. It is used for data transmission that uses acknowledgements and inputs to achieve reliable data transmission.
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.