Synchronization and Network Synchronization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which method has fast acquisition and can work without return link?
Open loop method
Closed loop method
Open & Closed loop method
None of the mentioned
Explanation:
The main advantage of open loop method is that acquisition is fast, the procedure can work without return link and the amount of real time computation that is required is small.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In phase lock which parameter is synchronized
Frequency
Phase
Frequency & Phase
None of the mentioned
Explanation:
Being in phase lock means that the receiver’s local oscillator is synchronized in both frequency and phase with the received signal.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Non coherent system requires
Phase synchronization
Frequency synchronization
Phase & Frequency synchronization
None of the mentioned
Explanation:
Non coherent system requires frequency synchronization.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
For block codes _____ is necessary.
Phase synchronization
Frequency synchronization
Frame synchronization
None of the mentioned
Explanation:
Frame synchronization is necessary when the information is organized in blocks or messages of some uniform number of symbols. Thus block code needs frame synchronization.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Coherent modulation requires ____ level of synchronization.
One
Two
Three
None of the mentioned
Explanation:
Coherent modulation requires three levels of synchronization – phase symbol and frame.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which method has two way link?
Open loop method
Closed loop method
Open & Closed loop method
None of the mentioned
Explanation:
Closed loop method requires return link, large amount of real time processing and has two way link.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Transmitter synchronization implies
One way communication
Two way communication
One & Two way communication
None of the mentioned
Explanation:
Transmitter plays a role in synchronization by varying the frequency and timing of its transmissions to correspond to expectation of receiver. This transmitter synchronization implies two way communication.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
As the synchronization levels increases, cost
Decreases
Increases
Remains the same
None of the mentioned
Explanation:
For each level increase in synchronization levels, cost increases.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Synchronization is used in system which has
Non coherent modulation techniques
Many users accessing
Non coherent modulation techniques & Many users accessing
None of the mentioned
Explanation:
For communication system using non coherent modulation techniques and many users accessing the central communication node, synchronization is necessary.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The synchronization necessary for BPSK is
Frequency tracking
Bit timing
Phase tracking
All of the mentioned
Explanation:
Non coherently detected BPSK is the simplest digital receiver and it requires frequency tracking, bit timing synchronizations and also phase synchronization.