EC2301 Digital Communication Unit Test 1 - July 2014 Question Paper

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B.E DEGREE, FIRST UNIT TEST, JULY 2014
FIFTH SEMESTER
EC 2301– DIGITAL COMMUNICATION
ELECTRONICS AND COMMUNICATION ENGINEERING
TIME: 1 Hour 30 minutes
MAX: 50 Marks
(Answer All Questions)

PART-A (7×2=14)
1. Mention the advantages of digital communication.
2. What is a Channel? Give examples.
3. What are the various types of pulse modulation techniques?
4. What are the types of mathematical models for Channel?
5. Define Bandwidth.
6. Define Base band model.
7. What is Symbol rate? 

PART-B (3×12=36)
8(a).  Explain the various analog pulse communication system describing their advantages and drawbacks.                                                           (12)
Or
(b). Describe how channels can be classified and briefly explain each. (12)                      
9(a). Describe the elements of digital communication system.                    (12)
Or
(b). Explain the mathematical models of various communication channels        (12)

10(a). Explain the geometrical representation of signals.               (12)
Or
(b)Write notes on Gram Schmidt Orthogonalization procedure            (12)