Dr. A.P.J. Abdul Kalam University MSC (Physics) IV SEM Communication Electronic [MSP404T] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Science (Physics)

Fourth Semester Main Examination, June-2021

Communication Electronic [MSP404T]

Time: 3:00 Hrs Max Marks 85

Note: Attempt all questions. Each question has two parts.

Part A is 10 marks and part B is 7 marks.

Q.1 (a) Write note on DSBSC modulation.

(b) Explain SSB modulation.

OR

(c) Define amplitude modulation and drive equation of AM wave?

(d) What is the need of Modulation in communication system.

Q.2 (a) What do you understand from geostationary satellite? Explain modules.

(b) Explain satellite communication with diagram.

OR

(c) Explain virtual height and fading signals.

(d) Explain the programming of waves.

Q.3 (a) Write note on programming of microwaves. Explain atmosphere effects of

propagation.

(b) Explain Fennal Zone. Problem used in microwave communication system.

OR

(c) Why conventional electronic vacuum tube fail to operate at microwave

frequency.

(d) Write the disadvantages of microwave transmission?

Q.4 (a) Explain PAM and channel BW for a PAM signal.

(b) Briefly explain flat top sampling.

OR

(c) Explain the terms natural sampling and flat top sampling.

(d) Explain adaptive delta modulation.

Q.5 (a) Explain the non-coherent detection of FSK signal and derive the expression for

the probability of error.

(b) Write short note on sampling theorem.

OR

(c) Show the difference between coherent and non-coherent Scheme.

(d) Write short note on White noise.

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