Digital Communication Questions and Answers

Digital Communications Questions and Answers – Digital Communication

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Digital communication”.

1. What are the disadvantages of digital communication?
a) Needs more bandwidth
b) Is more complex
c) Needs more bandwidth & Is more complex
d) None of the mentioned

Explanation: Digital communication requires more bandwidth, is more sophisticated, and results in minor performance decrease while converting from analogue to digital and vice versa.

2. Examples of digital communication are
a) ISDN
b) Modems
c) Classical telephony
d) All of the mentioned

Explanation: Digital communication requires more bandwidth, is more sophisticated, and results in minor performance decrease while converting from analogue to digital and vice versa.

3. Which system uses digital transmission?
a) ISDN
b) LANs
c) ISDN & LANs
d) None of the mentioned

Explanation: Whether the signal is analogue or digital, transmission on ISDN and LANs takes place in the digital domain.

4. The interval of frequencies outside which the spectrum is zero is called as ________
a) null to null bandwidth
b) normalized bandwidth
c) absolute bandwidth
d) none of the mentioned

Explanation: Absolute bandwidth refers to the range of frequencies beyond of which the spectrum is zero. It’s typically limitless.

5. The attenuation level in bounded power spectral density is
a) 35
b) 50
c) 35 & 50
d) none of the mentioned

Explanation: The bandwidth outside of which the spectrum must have decreased to a specified level below that observed at the band centre is known as bounded power spectral density.

6. Synchronization available in digital communication are
a) Symbol synchronization
b) Frame synchronization
c) Carrier synchronization
d) All of the mentioned

Explanation: Symbol synchronisation, frame synchronisation, and carrier synchronisation are all synchronisation techniques used in digital communication.

7. Digital system includes
a) Better encryption algorithm
b) Difficult data multiplexing
c) All of the mentioned
d) None of the mentioned

Explanation: The advantages of a digital system include a better encryption technique, easier data multiplexing, and increased reliability.

8. Analog to digital conversion includes
a) Sampling
b) Quantization
c) Sampling & Quantization
d) None of the mentioned

Explanation: The conversion from analogue to digital is a two-step procedure that includes sampling and quantization.

9. Digital communication is _______ to environmental changes?
a) Less sensitive
b) More sensitive
c) Does not depend
d) None of the mentioned

Explanation: Digital communication is less sensitive to environmental changes like temperature etc.

10. Advantages of digital communication are
a) Easy multiplexing
b) Easy processing
c) Reliable
d) All of the mentioned

Explanation: Digital communication is a very safe and secure method of communication. It is simple to multiplex, signal, and process, among other things.

11. What is necessary for digital communication?
a) Precision timing
b) Frame synchronization
c) Character synchronization
d) All of the mentioned

Explanation: Digital communication necessitates bit, character, and frame synchronisation, as well as precise timing. This is thought to be a drawback of digital communication.

Digital communication requires more bandwidth, is more sophisticated, and results in minor performance decrease while converting from analogue to digital and vice versa. Bounded power spectral density is the bandwidth outside of which the spectrum must have fallen to a set level below that measured at the band centre. Digital communication is a very secure and safe way to communicate. Multiplexing, signalling, and processing, among other things, are all easy.

Leave a Reply

Your email address will not be published. Required fields are marked *