Analog Communication Apr 2013

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Question paper of Pre-University Examination of Analog Communication held at Guru Nanak Education Trust Group of Institution, Roorkee in EVEN Semester Session: 2012-13

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Analog Communication Apr 2013

  1. 1. info4eee.blogspot.com | AN EEE BLOGGURU NANAK EDUCATION TRUST GROUP OF INSTITUTIONANALOG COMMUNICATION (TEC-405)PRE-UNIVERSITY EXAMINATIONSession: 2012-13 / EVEN SEMESTERB.Tech (ECE) 2ndYearWrite down your Roll No on the Question paper. M.M. 100Attempt All Questions. Each Questions carry equal Marks. Time: 2.30 Hr1. Attempt any four questionsa. Explain frequency division multiplexing and timedivision multiplexing, also compare them.b. Compare the following amplitude modulated systemfor transmission reception efficienciesi. DSB-SCii. SSB-SCc. Explain the followingi. Modulation indexii. Envelope detectoriii. Baseband and pass band signalsiv. Signal powerd. What is meant by the term channel as applied to acommunication system.e. Why is a high frequency carrier needed in acommunication system?f. Explain the difference between analog and digitalcommunications.2. Attempt any four questionsa. What is angle modulation? Explain different types ofangel modulation with mathematical expression.b. Explain the relationship between phase modulationand frequency modulation.c. Draw the circuit diagram of varactor diode modulationand explain its working.d. Explain Armstrong method for generation of widebandFM.e. Write comparison between narrow band FM and wideband FM.f. Explain the working of balanced frequencydiscrimination with the help of circuit diagram.3. Attempt any four questionsa. What is Nyquist rate and Nyquist interval?b. What are the merits of frequency modulation? Showhow a varactor can be used to produce a FM signal.c. What is phase modulation? How is it related tofrequency modulation? Find the expression of FMwave.d. What are the fundamental limitations ofcommunication systems?e. Explain single tone amplitude modulation withmathematical expression.f. Illustrate the principle of Armstrong system ofgenerating PM signal.4. Attempt any two questionsa. What are the advantages of pulse modulation overcarrier wave modulation? Explain pulse amplitudemodulation and pulse time modulation with the helpof suitable waveforms.b. State and prove the sampling theorem and also explainnatural sampling and flat top sampling with the help ofsuitable diagram?c. Explain the pulse code modulation system with itsrespective block diagram and derive the relationshipfor transmission bandwidth in a PCM system?5. Define any two of the followinga. What are different types of noise associated withcommunication system explain each in detail?b. Explain noise sources and derive the expression forvoltage and current models of a noisy resistor?c. Define any twoi. Equivalent noise bandwidth in communicationsystemii. Signal to noise ratioiii. Noise figureRoll No. +

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