University of Rajasthan 2008 B.C.A Computer Application ELECTRONIC COMMUNICATION AND DATA COMMUNICATION - Question Paper
Friday, 01 February 2013 04:05Web
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B.C.A. (Pt. II)
19-D 219 Pt.II
Bachelor of Computer Applications (Part II)
EXAMINATION, 2008
(Faculty of Science)
(Three-Year Scheme of 10+2+3 Pattern)
Paper 219
ELECTRONIC COMMUNICATION AND DATA COMMUNICATION
Time allowed: 2 hours
Maximum marks: 30
DESCRIPTIVE PART-II
Attempt 4 descriptive kind of ques. out
of six. All ques. carry 7.5 marks every.
1. (a) What is the need of modulation in long distance communication? [Marks 1.5]
(b) What is M-array pulse modulation? define giving suitable examples. [Marks 6]
2. (a) What do you mean by the term redundancy with respect to fault control techniques? [Marks 1.5]
(b) Using Cycling Redundancy Check (CRC) fault detection method, obtain the sequence of redundant bits i.e. CRC for the data unit 100100 when the CRC generator (divisor) used is 1101.
[Marks 6]
3. (a) What is electromagnetic radiation spectrum? Which parts of this spectrum are currently in use for long distance communication?
[Marks 1.5]
(b) What do you mean by the term propagation modes with respect to optical fiber communication? explain and define different propagation modes, used in optical fiber communication. [Marks 6]
4. (a) What is ISDN? List different ISDN channels available for subscriber access to ISDN (List only). [Marks 1.5]
(b) What do you mean by an orbit of a satellite? elaborate Geo-synchronous satellites? explain different advantages and disadvantages of using Geo-synchronous satellites. [Marks 6]
5. (a) What do you mean by digital-to-analog encoding? [Marks 1.5]
(b) define ASK, FSK, PSK and QAM digital-to-analog encoding techniques using suitable bit sequence and diagrams. [Marks 6]
6. Write short notes on the following:
(i) Duo-binary signaling
(ii) PCM waveforms(digital-to-digital encoding)
[Marks 3.5+4]
Earning: Approval pending. |