GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI EXAMINATION — SUMMER 2020
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Subject Code: 2161704 Date:26/10/2020Subject Name: Analog and Digital Communication
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Derive Equation for AM wave. 03
(b) Explain need of modulation. 04
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(c) Compare AM, FM and PM system in detail 07 Q.2 (a) How does return to zero and non return to zero binary data forms 03 differ?
(b) Compare RS 422 and RS 423 interface standards. 04
(c) Classify noise and explain noise in detail. 07
OR
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(c) Describe RS 449 interface standard. 07
Q.3 (a) Define following terms 03
1. Network Interface card
ii. Companding
iii. Cyclic redundancy check
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(b) Discuss the pre-emphasis & De-emphasis: 04(c) Explain frequency shift keying and application of it in detail. 07
OR
Q.3 (a) Define methods for error detection and error correction. 03
(b) Write a note on noise triangle with reference to FM. 04
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(c) Define data terminal and data communication equipments. 07 Q.4 (a) Explain ASK with waveforms 03
(b) Define Serial and Encoded data formats. 04
(c) Give basic concepts of light propagation for fiber cable design. 07
OR
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Q.4 (a) Explain FSK with waveforms 03
(b) Discuss advantages and disadvantages of communication using 04 optical fiber.
(c) Write about SONET topology and SONET frame. 07
Q.5 (a) Define IEEE 802.6 Metropolitan Area Network 03
(b) Describe Time Division Multiple Access. 04
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(c) Explain wireless LANs using CSMA/CA. 07OR
Q.5 (a) Define different network topologies. 03
(b) Compare frequency modulation with phase modulation 04
(c) Briefly describe OSI model architecture. 07
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This download link is referred from the post: GTU BE 2020 Summer Question Papers || Gujarat Technological University
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