GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Code: 2161704
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
Subject Name: Analog and Digital Communication
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | Explain adaptive delta modulation. | 03 |
| (b) | Define amplitude modulation and modulation index. Derive relation between the output power of an AM transmitter and depth of modulation. | 04 | |
| (c) | What do you mean by network topology? Explain different types of network topology in detail. | 07 | |
| Q.2 | (a) | Draw the block diagram of communication system and explain each block. | 03 |
| (b) | Explain DTE and DCE equipments. | 04 | |
| (c) | Explain in brief different types of noise. | 07 | |
| OR | |||
| (a) | Describe frequency modulation and give its mathematical representation. | 03 | |
| (b) | Explain parity error detection method. | 04 | |
| (c) | Explain the losses in the fiber optic cable. | 07 | |
| Q.3 | (a) | Explain bit-oriented protocols. | 03 |
| OR | |||
| (b) | Explain Pulse Code Modulation. | 04 | |
| (c) | Explain LRC and VRC error detection method along with suitable example. | 07 | |
| Q.4 | (a) | For a stream of data 11001010001, show the different encoded data formats in UNZ,URZ,BNZ-AMI, BRZ-AMI, ‘Manchester( Biphase ) and Differential Manchester codes | 03 |
| (b) | Explain IEEE 802.6 Metropolitan Area Network. | 04 | |
| (c) | Explain wireless LANs using CSMA/CA (IEEE 802.11) | 07 | |
| Q.5 | (a) | Describe OSI Model in detail. | 03 |
| OR | |||
| (b) | Explain Wave Division Multiplexing. | 04 | |
| (c) | Explain Optical Detector in detail. | 07 | |
| Q.5 | (a) | Describe RS232 interface standard and draw its null modem configuration. | 03 |
| (b) | Explain IEEE 802.3 Ethernet frame. | 04 | |
| (c) | Explain QPSK Modem in detail. | 07 | |
| Q.5 | (a) | Explain Time Division Multiplexing. Also discuss about multichannel TDM system. | 03 |
| OR | |||
| (b) | Explain Microwave communication in detail. | 04 | |
| (c) | Write a short note on SONET. | 07 | |
| Q.5 | (a) | Explain different methods of Satellite Communications. | 03 |
Date: 27/11/2018
Total Marks: 70
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