Home / ECE / Communication Systems :: Section-27

ECE :: Communication Systems

  1. Voltage to frequency converter performs ________
  2. A.
    Amplitude modulation
    B.
    Frequency modulation
    C.
    Phase modulation
    D.
    Angle modulation

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. The use of Pre-emphasis & de-emphasis in an FM system improves the noise performance over
  4. A.
    The entire frequency range
    B.
    Lower frequency range
    C.
    Higher frequency range
    D.
    Medium frequency range

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. In communication system, Noise is most likely to affect the signal at
  6. A.
    At the transmitter
    B.
    In the channel
    C.
    In the information source
    D.
    At the destination

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Noise figure of merit is unity for ______
  8. A.
    AM
    B.
    FM
    C.
    PCM
    D.
    SSB-SC

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Entropy gives __________
  10. A.
    Amount of information
    B.
    Rate of information
    C.
    Measure of uncertainity
    D.
    Probability of message

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The information rate is defined to be_________
  12. A.
    Average num of bits of information/sec
    B.
    Average information per message interval
    C.
    Total num of bits/sec
    D.
    None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency
  14. A.
    To help the image frequency rejection
    B.
    To permit easier tracking
    C.
    Because otherwise an intermediate frequency could not be produced
    D.
    To all adequate frequency coverage without switching

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. In a Commercial FM Broadcasting, the maximum frequency deviation is _______
  16. A.
    75 KHz
    B.
    200 KHz
    C.
    5 KHz
    D.
    15 KHz

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Time division multiplexing is superior to Frequency division multiplexing because
  18. A.
    Interchannel cross talk is avoided
    B.
    Circuitary required is digital
    C.
    Noise is absent
    D.
    Bandwidth requirement is reduced

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. In a Wide band FM system, the output signal to noise ratio increases
  20. A.
    Linearly as the bandwidth
    B.
    As the square root of the bandwidth
    C.
    As the square of the bandwidth
    D.
    As the cube of the bandwidth

    View Answer

    Workspace

    Discuss Discuss in Forum