Network Synchronization MCQ’s

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

1. Coherent modulation requires ____ level of synchronization.
a) One
b) Two
c) Three
d) None of the mentioned

2. Synchronization is used in system which has
a) Non coherent modulation techniques
b) Many users accessing
c) Non coherent modulation techniques & Many users accessing
d) None of the mentioned

3. For block codes _____ is necessary.
a) Phase synchronization
b) Frequency synchronization
c) Frame synchronization
d) None of the mentioned

4. Which method has fast acquisition and can work without return link?
a) Open loop method
b) Closed loop method
c) Open & Closed loop method
d) None of the mentioned

5. Transmitter synchronization implies
a) One way communication
b) Two way communication
c) One & Two way communication
d) None of the mentioned

6. As the synchronization levels increases, cost
a) Decreases
b) Increases
c) Remains the same
d) None of the mentioned

7. Non coherent system requires
a) Phase synchronization
b) Frequency synchronization
c) Phase & Frequency synchronization
d) None of the mentioned

8. Which reduces the effective distance between signals in signal space?
a) Time error
b) Frequency offset
c) Time error & Frequency offset
d) None of the mentioned

9. Which method has two way link?
a) Open loop method
b) Closed loop method
c) Open & Closed loop method
d) None of the mentioned

10. In phase lock which parameter is synchronized
a) Frequency
b) Phase
c) Frequency & Phase
d) None of the mentioned

11. When a terminal is able to utilize the measurements made on the return link it is called as
a) Open loop method
b) Closed loop method
c) Quasi close loop method
d) None of the mentioned

12. Which method needs precorrect time?
a) Open loop method
b) Closed loop method
c) Open & Closed loop method
d) None of the mentioned

13. The synchronization necessary for BPSK is
a) Frequency tracking
b) Bit timing
c) Phase tracking
d) All of the mentioned

14. The system which has ______ signal to noise ratio can tolerate larger timing error.
a) Large
b) Small
c) Large & Small
d) None of the mentioned

15. Which method requires external authority and is inflexible?
a) Open loop method
b) Closed loop method
c) Open & Closed loop method
d) None of the mentioned

16. In open loop method, the time reference error __________ with respect to time.
a) Increases exponentially
b) Decreases exponentially
c) Increases quadratically
d) Decreases quadratically

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