# Dr.A.P.J.Abdul Kalam University MSC PHYSICS IV SEM JUNE20 Communication Electronic [MSP404T] Aug-Sep 2020 Question Paper

Dr.A.P.J.Abdul Kalam University Old Question Papers

Master of Science (Physics)

Fourth Semester Main Examination, Aug-Sep 2020

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) Define amplitude modulation and derive equation for AM wave.

OR

(a) What is the need modulation in communication system?

(b) Explain SSB modulation.

Q.2 (a) Explain satellite communication with diagram.

OR

(a) What do you understand from geo stationary satellite? Explain modules.

(b) Explain sky wave propagation.

Q.3 (a) Explain Fennal Zone. Problem used in microwave communication system.

(b) Why conventional electronic vacuum tube fail to operate at microwave frequency.

OR

(a) Write note on sampling theorem also explain low pass and bond pass signal.

(b) What is the difference between DBMS modulation & SSB modulation?

Q.4 (a) What is mean by quantization? Derive the expression for signal to quantization noise ratio in PCM

system.

(b) Explain Pulse modulation system.

OR

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

Q.5 (a) Point out the probability of error for coherent and non- coherent scheme.

(b) Summarize the transmitter, Receiver and generation of non–coherent version of PSK (Short Note).

OR

(a) Write short notes on sampling theorem.

(b) Define satellite system.

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