advance-communication-system-mcqs - Set (2)

Correct Answer: Orange && Worng Answer: Red

1. In Sky wave propagtion, propagated waves are refracted from ______

  • (A). Troposphere
  • (B). Ionosphere
  • (C). Stratosphere
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    2. Which of the following is line of sight distance, if height of transmitting and receiving antennas are 64 meter each. Consider earth is flat

  • (A). 57 meter
  • (B). 57 kilometer
  • (C). 228 kilometer
  • (D). 228 meter
    • View Answer

    Explanation: Not Avilable

    3. Which of the following is non-linear modulation technique

  • (A). A.M
  • (B). F.M
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    4. Which of the following is example of external noise

  • (A). Atmospheric noise
  • (B). Cosmic noise
  • (C). Shot noise
  • (D). Both (a) and (b)
    • View Answer

    Explanation: Not Avilable

    5. Shot noise is produced in ______

  • (A). Semiconductor
  • (B). Conductor
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    6. Noise figure is always ______ one

  • (A). Greater than
  • (B). Less than
  • (C). Equal to
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    7. Satellites operate in the frequency range of

  • (A). 300 MHz to 3GHz
  • (B). 3 GHz to 30 GHz
  • (C). 3 MHz to 30 MHz
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    8. Transponder is used to ______

  • (A). Receive Signal
  • (B). Transmit Signal
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    9. Which of the following fiber is more resistant to micro-bending loss

  • (A). Step index fiber
  • (B). Graded index fiber
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    10. Which of the following is part of optical fiber

  • (A). Core
  • (B). Cladding
  • (C). Coating
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    11. PIN diode can be used as ______

  • (A). Optical detector
  • (B). Optical source
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    12. Frequency range of X-band radar is ______

  • (A). 8 – 12 GHz
  • (B). 12 – 18 Ghz
  • (C). 8 – 12 MHz
  • (D). 18 – 27 GHz
    • View Answer

    Explanation: Not Avilable

    13. If PT power is fed to an isotropic antenna, then power radiated

  • (A). PT/R2 Watt/m2
  • (B). PT/R Watt/m
  • (C). PT/(2πR2)Watt/m2
  • (D). PT/(4πR2)Watt/m2
    • View Answer

    Explanation: Not Avilable

    14. Which of the following is part of MTI radar

  • (A). Phase detector
  • (B). Delay line
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    15. Probabilities of symbols x and y are P(x) and P(y) respectively. Information contents of symbols x and y are I(x) and I(y). Which of the following inequality is correct –

  • (A). I(x)>I(y) if P(x)>P(y)
  • (B). I(x)< I(y) if P(x)< P(y)
  • (C). I(x)>I(y) if P(x)< P(y)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    16. Bit/symbol is unit of ______

  • (A). Entropy
  • (B). Information rate
  • (C). Information content
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    17. [P(y/x)]=[[1-P P],[P, 1-P]] is the channel matrix of ______

  • (A). Lossless channel
  • (B). Deterministic channel
  • (C). Noiseless channel
  • (D). Binary symmetric channel
    • View Answer

    Explanation: Not Avilable

    18. Which of the following provides two-way communication

  • (A). Cellphone
  • (B). Pager
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    19. Which of the following is part of facsimile system

  • (A). Recorder
  • (B). Scanner
  • (C). Modem
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    20. Modems are used for ______

  • (A). Power supply
  • (B). Data transfer
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

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