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Engineering BE Electronics and Computer Science Sem 4 December 2018 2018 Principles Of Communication Engineering Question Paper - Mumbai University | munotes

December 2018 Question Paper.pdf
ELECTRONICS ELECTRONICS & COMPUTER SCIENCE · 106 KB · 1 May 2025

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Questions asked in this paper

  1. Q2 Attempt any three questions out of the remaining five questions
  2. Q1 Answer the following (any four): 20 marks
    • a) Explain how quantization helps in noise removal
    • b) Explain why the local oscillator frequency is always chosen as and not
    • c) Explain noise triangle in FM
    • d) Determine the overall noise factor and noise figure for three cascade amplifiers with the following parameters:
    • e) Calculate percentage saving in AM modulated wave depth of 100 percent when the carrier and one of the sidebands are suppressed. Compare AM with SSB-SC
  3. Q2 a) With the help of a neat bock diagram explain the FM transmitter using Armstrong method of FM generation 5 marks
    • b) In a super-heterodyne receiver having no RF amplifier, the loaded Q of the antenna 5 coupling circuit is 100. If the IF is 455kHz, calculate: 1) The image frequency and its rejection ratio for the tuning at 1044kHz. 2) The image frequency. and its rejection ratio for the tuning at 30MHz
    • c) With a neat block diagram explain the working of super-heterodyne receiver,with 10 waveforms at the output of each block. Explain the functions of each block
  4. Q3 a) Explain the terms with reference to Radio Receivers: Selectivity, Sensitivity, Fidelity AGC and Double spotting 10 marks
    • b) Explain the frequency discriminators with the help of neat diagrams. 10
  5. Q4 a) Explain PAM,PWM and PPM generation with relevant waveforms. 10 marks
    • b) Explain natural sampling and flat top sampling . What is aliasing error? How it can be 10
  6. Q5 a). Derive the expression for the signal to quantization noise ratio in PCM. 5 marks
    • b) FM system, when the audio frequency is 400Hz and the AF voltage is 4V, the 5 deviation is 4.8kHz. Calculate the modulation index and the bandwidth required. If the modulating frequency is halved, what is the new bandwidth?
    • c) the working of Delta Modulation with a neat block diagram and showing 10 FDM with a neat block diagram. Give its applications. 10
    • b) Draw block diagram of PCM transmitter and receiver and explain the function of each 10

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