# COMMUNICATION THEORY

May 2nd, 2015
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1. Define Amplitude Modulation. 2. What is AM wave envelope? 3. Define modulation index for an AM wave.

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COMMUNICATION THEORYS K C TDEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERINGQUESTION BANKSUB.NAME: COMMUNICATION THEORYYEAR /SEM : II / IV______________________________________________________________________________UNIT IAMPLITUDE MODULATION SYSTEMSPART-A (2 Marks)1. Define Amplitude Modulation.2. What is AM wave envelope?3. Define modulation index for an AM wave.4. List out the advantages of AM.5. Define the transmission efficiency of AM signal6. As related to AM, what is over modulation, under modulation and 100% modulation? 7. Define FDM .8. Define SSB.9. Mention the applications of SSB.10. Mention the advantages of VSB.PART-B (16 Marks)1. (a).Explain the generation of AM signals using square law modulator.(8)(b).Explain the detection of AM signals using envelope detector.(8)2. Explain Balanced modulator to generate DSB-SC signal.(16)3. Explain coherent detector to detect SSB-SC signal.(16)4. Explain the generation of SSB using balanced modulator.(16)5. Draw the circuit diagram of Ring modulator and explain with its operation.(16)6. Discuss the coherent detection of DSB-SC modulated wave with a block diagram of detector and Explain.(16)7. Draw the block diagram for the generation and demodulation of a VSB signal and explain the principle of operation.(16)8. Write short notes on frequency translation and FDM.(16)UNIT IIANGLE MODULATION SYSTEMSPART-A (2 Marks)1. Define PM.2. Define FM.3. Define F

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