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# Mahatma Gandhi University (MGU) 2011-3rd Sem M.C.A MODEL ( Revised Syllabi) 305 DATA COMMUNICATIONS - Question Paper

Saturday, 18 May 2013 10:10Web

MAHATMA GANDHI UNIVERSITY
MCA DEGREE exam
MODEL ques. PAPER
(2011 Revised Syllabi)
Third Semester
MCA305 DATA COMMUNICATIONS
Time : 3 hours Maximum : 75 Marks
Part A
ans any ten ques..
every ques. carries three marks.
1. describe the terms frequency and period of a signal.
2. Compare analog and digital transmission.
3. A periodic signal is decomposed into 5 sine waves with frequencies 100, 200, 300,
400, 800 Hz what is the bandwidth?
4. describe line coding? elaborate its characteristics?
5. Consider the subsequent lists stream: 110011000101 . Encode the above bit stream using.
a) NRZ – L b) NRZ – I
6. describe sampling theorem.
7. describe the terms bit rate and band rate. provide the relation ranging from them?
8. discuss the terms multiplexing and demultiplexing.
9. Compare parallel transmission and serial transmission.
10. Differentiate ranging from circuit switching and packet switching.
11. What is hand off?
12. discuss frequency – Reuse principle?
(10 x three = 30 marks)
Part B
All ques. carry equal marks.
13. a) discuss the various transmission impairments that affect data communications
OR
b) discuss characteristics of micro waves and its applications in detail.
14. a) Differentiate ranging from Manchester and differential Manchester encoding methods with
relevant wave forms.
OR
b) discuss different steps in pulse code modulation.
15. a) With a neat diagram, discuss FDM with respect to multiplexing and demultiplexing, and
mention its applications.
OR
b) discuss ASK, PSK, and QAM in detail.
16. a) elaborate virtual circuit networks? discuss the characteristics of virtual circuit networks. OR
b) Differentiate ranging from circuit switching and packet switching.
17. a) discuss ADSL technology in detail.
OR
b) current a tutorial on 2nd generation mobile systems.
(5 X nine = 45 marks)