[Total No. of Questions - 8]
[Total No. of Printed Pages - 2]


B.E. Vth Semester Examination
BE-V/12(A)
229291
E&C Engineering
Course No. ECE - 502
Communication Engineering-I
New Syllabus
Time Allowed - 3 Hours Maximum Marks - 100

Note: Attempt five questions in all, selecting at least two question from each section. All questions carry equal marks.

Section - A

    1. The carrier performs certain functions in radio communication. What are they?
    2. Draw and explain the block diagram of a communication system.
    1. Obtain the fourier transform of a rectangular pulse of duration of 2 seconds and having a magnitude of 10 volts as shown in the fig:
    2. Discuss the various conditions for the existence of the continuous time fourier series.
    1. Explain in detail the filter system for the generation of SSB signal.
    2. Why the local oscillator frequency is kept higher than the signal frequency in super-heterodyne receivers? Give circuit diagram.
    1. Explain the operation of Balanced Slope Detector using a circuit diagram.
    2. Explain what double spotting is and how it arises?

Section - B

    1. What is companding? What is it used for? Why is it preferable to have tapered steps in quantization.
    2. Define Nyquist rate and prove sampling theorem.
    1. What is slope overload error in delta modulation? How isit overcome?
    2. Explain how a message is transmitted by PCM? How is the effect of addition noise reduced by quantization in PCM system.
    1. Briefly describe camera and picture tube of a monochrome T.V. and explain how scanning helps in picking up and reproduction of picture information.
    2. Explain the difference between chrominance and luminance. How is colour picture tube able to display white?

  4. Write short notes on:
    1. Vestigial Side Band
    2. Interlaced scanning





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