Evaluating Digital Communication System and Allocation of Communication Resources MCQ

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• The orbital period of communication satellites is _______ as that of earth’s rotational period.
  ক

  Same

  খ

  Greater

  গ

  Lesser

  ঘ

  None of the mentioned
• The super group is made up of
  ক

  Five groups

  খ

  Sixty channels

  গ

  Five groups & Sixty channels

  ঘ

  None of the mentioned
• The mixing and filtering of DSB removes
  ক

  LSB

  খ

  USB

  গ

  LSB & USB

  ঘ

  None of the mentioned
• In double side band spectrum which side-band is called as inverted side-band?
  ক

  LSB

  খ

  USB

  গ

  LSB & USB

  ঘ

  None of the mentioned
• Channelization characterized by orthogonal spectra is called as
  ক

  Time division multiplexing

  খ

  Frequency division multiplexing

  গ

  Time division & Frequency division multiplexing

  ঘ

  None of the mentioned
• In polarization division technique ______ polarization is used.
  ক

  Orthogonal

  খ

  Non orthogonal

  গ

  Orthogonal & Non orthogonal

  ঘ

  None of the mentioned
• In which technique spot beam antennas are used to point the radio signals in different directions?
  ক

  Code division

  খ

  Space division

  গ

  Frequency division

  ঘ

  None of the mentioned
• How can the throughput of the system be increased?
  ক

  Increasing EIRP

  খ

  Increasing channel bandwidth

  গ

  Decreasing system losses

  ঘ

  All of the mentioned
• For more than two quantization level, _______ is used.
  ক

  Hard decision

  খ

  Soft decision

  গ

  Hard & Soft decision

  ঘ

  None of the mentioned
• Code’s redundancy is given as
  ক

  n/k

  খ

  k/n

  গ

  nk

  ঘ

  None of the mentioned
• The transmission rate is given as
  ক

  R/log2M

  খ

  log2M/R

  গ

  R/log10M

  ঘ

  log10M/R
• Which modulation is selected for power limited system?
  ক

  MPSK

  খ

  MFSK

  গ

  MPSK & MFSK

  ঘ

  None of the mentioned
• In MFSK, R/W
  ক

  Increases with increase in M

  খ

  Increases with decrease in M

  গ

  Decreases with increase in M

  ঘ

  Is not dependent on M
• In MPSK, R/W
  ক

  Increases with increase in M

  খ

  Increases with decrease in M

  গ

  Decreases with increase in M

  ঘ

  Is not dependent on M
• The system will be more bandwidth efficient as WTb decreases.
  ক

  True

  খ

  False
• Which refers to the presence of error correction coding scheme?
  ক

  Coded

  খ

  Uncoded

  গ

  Coded & Uncoded

  ঘ

  None of the mentioned