Digital Communications Q & A – Digital Communication System

This set of tough Digital Communication Questions & Answers focuses on “Digital Communication System”.

MCQs based on Digital Communication System:

1. Which are the common transmission media used in digital communication system?
a) Coaxial cable
b) Twisted copper cable
c) Radio frequency bands
d) All of the mentioned

 

2. The basic transmission-reception system is a ______ system.
a) Two block system
b) Three block system
c) Four block system
d) None of the mentioned

 

3. Modulation channel consists of
a) Amplifier
b) Signal processing units
c) Both of the mentioned
d) None of the mentioned

 

4. Modulation channel does not accept analog input signal.
a) True
b) False

 

5. If operating frequency bands are higher ______ is available.
a) Smaller bandwidth
b) Larger bandwidth
c) Both of the mentioned
d) Cannot be determined

 

6. Ground wave communication occurs in
a) Low frequency band
b) Medium frequency band
c) Both of the mentioned
d) None of the mentioned

 

7. Sampling theorem is used for converting
a) Continuous time signal to discrete
b) Discrete to continuous time signal
c) Both of the mentioned
d) None of the mentioned

 

8. A signal can be recovered from its sample by using
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band stop filter

 

9. Which is practically realizable?
a) A train of pulses
b) Impulse train
c) Both of the mentioned
d) None of the mentioned

 

10. In flat top sampling scheme, ______ is kept constant after sampling.
a) Amplitude
b) Phase
c) Frequency
d) Time period

 

11. Loop filter is a ______ used to reduce noise.
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band reject filter

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