Signal Time Spreading MCQ’s

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This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Signal Time Spreading”.

1. When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.
a) Time selective
b) Frequency selective
c) Frequency non selective
d) None of the mentioned

2. When a user’s moving, the user’s velocity causes shift in frequency. This is called as
a) Doppler shift
b) Frequency shift
c) Velocity shift
d) None of the mentioned

3. If delay time is lesser than symbol time, ______ fading occurs.
a) Frequency non selective
b) Flat
c) Frequency non selective & Flat
d) None of the mentioned

4. Multiple isolated peaks in multipath components is called as
a) Fingers
b) Returns
c) Fingers & Returns
d) None of the mentioned

5. If signalling rate is less than fading rate, _____ fading occurs.
a) Slow
b) Fast
c) Time selective
d) None of the mentioned

6. Channel’s time spreading properties are
a) Coherence bandwidth
b) Signal dispersion
c) Coherence bandwidth & Signal dispersion
d) None of the mentioned

7. If delay time is greater than symbol time, _______ fading occurs.
a) Frequency selective
b) Time selective
c) Frequency non selective
d) None of the mentioned

8. Minimum time required for magnitude change or phase change is called as
a) Shift time
b) Coherence time
c) Delay time
d) None of the mentioned

9. Coherence time is _______ to Doppler spread.
a) Directly proportional
b) Inversely proportional
c) Not dependent
d) None of the mentioned

10. When transmitter and receiver moves towards each other, the magnitude of frequency shift is
a) Positive
b) Negative
c) Zero
d) Infinity

11. When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.
a) Fast
b) Slow
c) Time selective
d) None of the mentioned

12. If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.
a) Flat
b) Frequency selective
c) Fast fading
d) Time selective

13. The effect of Doppler shift can be counterattacked by
a) OFDM
b) By using two receivers with separate antennas
c) By using diversity receiver
d) All of the mentioned

14. Block fading occurs in
a) Frequency domain
b) Time domain
c) Frequency & Time domain
d) None of the mentioned

15. Frequency tracking loop can minimize irreducible error rate by using
a) GMSK
b) DMSK
c) MSK
d) QAM

16. Flat fading can be avoided or stopped by
a) Error coding
b) Equalization
c) Adaptive bit loading
d) All of the mentioned

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