ESSAY TYPE QUESTIONS FOR ANALOG AND DIGITAL COMMUNICATION SYSTEMS

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UNIT 1

  1. Time domain equation for AM ? Calculate  its band width and draw frequency spectrum for AM ?
  2. Give efficiency in AM ? Derive  Relation between Pt and Pc ?
  3. Time domain equation for FM ? Merits of FM over AM ?
  4. What are different types of suppressed carriers , Need for suppressed carriers ?
  5. Explain DSB-SC, SSB-SC with neat block diagram ? give any 3 applications ,advantages ,dis-advantages ?
  6. Define noise , S/N ratio, N.F, N.T , classification of noise , effects of noise in communication ?
  7. (a) Define pre-emphasis and de-emphasis and explain with neat circuit diagram ?  Advantages of pre-emphasis and de-emphasis



UNIT 2

  1. Draw and explain the block diagram of PCM coding and decoding ?
  2. Explain sampling theorem & conversion of analog signal  to digital signal ? 
  3. Explain PAM,PPM, PWM with block diagram and wave forms ?
  4. Compare PAM,PPM,PWM ? Define sampling ,quantization ,encoding ?


UNIT 3

  1. Explain synchronous and asynchronous transmission techniques ? Need for start and stop bits in asynchronous transmission ?
  2. Explain  CRC,VRC,LRC & CHECK SUM ?
  3. Explain hamming code in error detection and correction  ?
  4. Explain ASK,FSK,PSK (BASK,BPSK,BFSK) with block diagram and wave forms ?
  5. Compare ASK ,FSK, PSK ,QAM and give any 3 applications adv,dis-adv of them  ?

UNIT 4

  1. Explain LOW LEVEL & HIGH LEVEL AM transmitters with neat block diagram ?
  2. Explain ARMSTRONG / FM INDIRECT method of transmission ?
  3. Explain super heterodyne receiver with neat block diagram ?
  4. Explain TRF receiver with neat block diagram ?
  5. Define heterodyning ,sensitivity ,selectivity ,fidelity ? explain  need for AVC concept ?
  6. Process of demodulation in AM receivers with neat circuit?
  7. Explain FOSTER SEELY DISCRIMINATOR ?

UNIT 5

  1. Explain FDM with neat block diagram ?  Advantages and disadvantages for it ?
  2. Explain TDM with neat block diagram ?  Advantages and disadvantages for it ?
  3. Explain DSL ,ADSL with neat block diagram ?

  • Define modem ? Types of modem ? 
  • Define multiplexing ? Types of multiplexing ? 
  • Need for AVC?
  • Difference between TDM,FDM ?

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