PHYSICS MAGADH UNIVERSITY QUESTION POST- GRADUATE ( Electronic and communication)

PHYSICS MAGADH UNIVERSITY QUESTION POST- GRADUATE ( Electronic and communication)

                                                                       2014-2016
                                                                  Time: 3 hours
                                                                  Full marks: 80
                                            Candidates are required to give their answers in
                                                   their own words as far as practicable.
                                                        The questions are of equal value.
                                                            Answer any four questions.

1. Outline time and frequency analysis of a septem. What are the impulse and step response function?

2. Explain the following terms:
    (a). Signal to noise raio (SNR)
    (b). Noise equivalent bandwidth

3. Explain Analog to digital signal conversion. What is delta modulation?

4. Describe various elements of digital communication. what is multiplexer?

5. Explain line coder. Outline power spectral density for line coding.

6. Explain the following terms:
    (a). TDM
    (b). STATDM

7. Give a brief idea about M-ray signaling scheme. What is ASK?

8. State and explain Sampling theorem. What is pulse code modulation?

9. Outline the concept of base band and carrier system. what is Noise figure?

10. Write short notes on any two of the following:
      (a). Classification of signal and its characterization.
      (b). Noise in communication system
      (c). Principle of Digital data- transmission
      (d). Analog signal reconstruction