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Pune University - Sem - II : Communication Electronics, April 2010 (Old Course)

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Total No. of Questions : 5] P1164 [Total No. of Pages : 4 [3729]-23 M.Sc. ELECTRONIC SCIENCE EL2 UOT03 : Communication Electronics (Old Course) (Semester - II) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) 2) 3) All questions are compulsory. Figures to the right indicate full marks. Draw neat and labelled diagrams wherever necessary. Q1) Attempt any four of the following : [4 4 = 16] a) What are sources of noise? Establish frequency domain characterization of noise. b) Define i) Sensitivity, ii) Selectivity, iii) Signal to noise ratio, iv) Dynamic range with context to Am-receiver. c) Compare ratio detector and discriminator in FM detectors. d) What is companding? What are its advantages in digital communication? e) Compare between voice and data transmission. Q2) Attempt any two : [2 8 = 16] a) Explain FM transmitter and receiver with block diagram. b) What are the sections of internal layout of communication satellite. Draw and explain single channel transponder block diagram. c) Explain Pulse Amplitude Modulation and recovery of the PAM signal in detail. Q3) Solve any two : [2 8 = 16] a) Explain the importance of bit oriented protocol. Draw the basic format of SDLC and HDLC messages. Give the significance of each field. P.T.O. b) What do you mean by bit rate? Explain ASK, FSK and Q-PSK. c) What are the advantages of SSB amplitude modulated transmission? Explain the phase-shift method of SSB AM generation. Q4) Attempt any four : [4 4 = 16] a) Explain the basic elements of communication system with block diagram. b) Why R.F. Amplifier is necessary in FM receivers? With circuit diagram explain RF amplifier. c) Explain the diode type balanced modulator used for suppressing the carrier. d) What are basic principles of ISDN? Enumerate types of connection to the network provided by it. e) Explain the working of delta modulated transmitter system. Q5) Solve any four : [4 4 = 16] a) What are the types of telephone modem? Explain any one of them. b) Explain telemetry with suitable diagram. c) An FM broadcast carrier is deviated by 30 kHz. Find the % of modulation. The maximum carrier frequency change for FM broadcast radio is 75 kHz. d) Explain the difference between unipolar NRZ code and bipolar NRZ code. Mention the draw-back of NRZ code. e) Explain the following terms with reference to satellite communication. i) Uplink. ii) Downlink. iii) Cross talk. iv) Propagation delay. [3729]-23 2

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Additional Info : M.Sc. - I Electronic Science, EL2 UOT 03 : Communication Electronics (Old Course) (Semister - II), Pune University
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