This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Mobile radio propagation”.
1. What is the source for performance degradation?
a) Thermal noise
b) Man made noise
c) Natural noise
d) All of the mentioned
View Answer
Explanation: The sources for performance degradation are thermal noise, natural noise and man made noise.
2. The received power is attenuated by a factor called
a) Path loss
b) Free space loss
c) Path & Free space loss
d) None of the mentioned
View Answer
Explanation: The received power expressed in terms of transmitted power is attenuated by a factor called path loss or free space loss.
3. Scintillation describes the fading caused by
a) Atmospheric changes
b) Physical changes
c) Thermal noise
d) Propagating effects
View Answer
Explanation: Scintillation is used to describe fading caused by physical changes in the propagating medium.
4. Large scale fading refers the attenuation in
a) Amplitude
b) Phase
c) Signal power
d) None of the mentioned
View Answer
Explanation: large scale fading refers to signal power attenuation or path loss due to motion in large area.
5. Small scale refers to changes in
a) Amplitude
b) Phase
c) Amplitude & Phase
d) None of the mentioned
View Answer
Explanation: Small scale fading refers to changes in amplitude and phase as a result of small changes in spatial positioning between transmitter and receiver.
6. Small scale fading manifests due to
a) Signal dispersion
b) Time variant behavior
c) Signal dispersion & Time variant behavior
d) None of the mentioned
View Answer
Explanation: Small scale fading manifests itself in two mechanisms- time spreading of the signal ( signal dispersion) and time variant behavior of the channel.
7. The parameters used to describe large scale fading are
a) Reference distance
b) Path loss exponent
c) Standard deviation of random variable
d) All of the mentioned
View Answer
Explanation: The parameters used to statistically describe path loss due to large scale fading are reference distance, path loss exponent and standard deviation of random variable.
8. Small scale fading occurs due to
a) Doppler shift
b) Time delay
c) Doppler shift & Time delay
d) None of the mentioned
View Answer
Explanation: Small scale fading occurs due to time delay and frequency or Doppler shift.
9. What are the types of small scale fading that occurs due to Doppler shift?
a) Slow fading
b) Fast fading
c) Slow & Fast fading
d) None of the mentioned
View Answer
Explanation: Slow fading and fast fading occurs due to Doppler or frequency shift.
Sanfoundry Global Education & Learning Series – Digital Communications.
To practice all areas of Digital Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.
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