Abstraction and Layering

Digital Communications Systems

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

1. Top layer is
a) Physical media
b) Application
c) Design
d) None of the mentioned

2. Entities also does
a) Error correction
b) A/D
c) D/A
d) All of the mentioned

3. In channel, delay is
a) Fixed
b) Variable
c) Fixed & Variable
d) None of the mentioned

4. Channel can provide connectivity to
a) Point to point
b) 1 to many
c) Many to many
d) All of the mentioned

5. Embedding is a form of
a) Abstraction
b) Layering
c) Entity sharing
d) None of the mentioned

6. Transmission media is
a) Acoustic
b) Guided
c) Optical
d) All of the mentioned

7. In transmission media, the symbol type is generally
a) Analog
b) Digital
c) Analog & Digital
d) None of the mentioned

8. Noise is _____ in nature.
a) Random
b) Systematic
c) Random or Systematic
d) None of the mentioned

9. The radiation loss increases as
a) Frequency increases
b) Frequency decreases
c) Does not depend on frequency
d) None of the mentioned

10. Attenuation is a function of
a) Channel length
b) Transmission media
c) Signal frequencies
d) All of the mentioned

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