advance-communication-system-mcqs - Set (4)

Correct Answer: Orange && Worng Answer: Red

1. Which of the following radio wave is reflected back to Earth from the ionosphere ?

  • (A). Sky wava
  • (B). Ground wave
  • (C). Space wave
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    2. Which of the following wave propagates in the frequency range of 30MHz to 300MHz?

  • (A). Sky wave
  • (B). Space wave
  • (C). Ground wave
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    3. Which of the following statement is correct for ground wave propagation ?

  • (A). It is used for A.M transmission
  • (B). It is used for F.M transmission
  • (C). It is used for T.V transmission
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    4. Which of the following is lower sideband signal in Amplitude modulation?

  • (A). m/2 Vc Cos(Wc-Wm)t
  • (B). m/2 Vc Cos(Wct)
  • (C). m/2 Vc Cos(Wmt)
  • (D). Vc Cos(Wct)
    • View Answer

    Explanation: Not Avilable

    5. Which of the following broadcast is operated in frequency band of 88 MHz to 108 MHz ?

  • (A). A.M
  • (B). F.M
  • (C). P.M
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    6. In Which of the following modulation technique, modulation index depends on frequency of message signal ?

  • (A). P.M
  • (B). F.M
  • (C). A.M
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    7. Which of the following noise is generated by automobile, electic motors and switching equipment ?

  • (A). Thermal noise
  • (B). Shot noise
  • (C). Industrial noise
  • (D). Atmospheric noise
    • View Answer

    Explanation: Not Avilable

    8. Which of the following statements is correct ?

  • (A). Thermal noise is independent of frequency
  • (B). Thermal noise is generated in resistance
  • (C). Industrial noise is a type of internal noise
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    9. Which of the following statement is correct for cellular mobile communication ?

  • (A). Cell size is fixed
  • (B). Cell size can be increased or decreased
  • (C). Adjacent cells can not use the same frequency
  • (D). Both (b) and (c)
    • View Answer

    Explanation: Not Avilable

    10. In hard hand off, a mobile station communicates with

  • (A). Only one base station
  • (B). Two base stations
  • (C). Three base stations
  • (D). Four base stations
    • View Answer

    Explanation: Not Avilable

    11. Which of the following is the first satellite launched by INDIA ?

  • (A). ARYABHATTA
  • (B). APPLE
  • (C). INSAT-1A
  • (D). None of thes
    • View Answer

    Explanation: Not Avilable

    12. Which of the following statement is correct for LEO satellite ?

  • (A). It is located at altitudes between 500 and 2000 Km.
  • (B). It revolves around the earth in 90 to 120 minutes
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    13. Which of the following statement is correct for optical fiber cable ?

  • (A). Core is surrounded by cladding
  • (B). Cladding is more dense compared to core
  • (C). Cladding is surrounded by core
  • (D). Core and cladding have same density.
    • View Answer

    Explanation: Not Avilable

    14. Which of the following loss occurs when two optical fibers are joined together to make a longer optical fiber ?

  • (A). Coupling loss
  • (B). Spline loss
  • (C). Micro bending loss
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    15. Which of the following device connects transmitter or receiver to the antenna alternately ?

  • (A). Transponder
  • (B). Synchronizer
  • (C). Duplexer
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    16. In which of the following RADAR is use ?

  • (A). Air traffic control
  • (B). Remote sensing
  • (C). Military
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    17. Which of the following statement is correct for MTI RADAR ?

  • (A). It uses dopper effect for its operation
  • (B). It cannot measure range of a target
  • (C). It can recognize colour of target
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    18. If P(Xi)=1/8, then amount of information I(Xi)

  • (A). 3 bits
  • (B). 8 bits
  • (C). 2 bits
  • (D). 4 bits
    • View Answer

    Explanation: Not Avilable

    19. Which of the following is one way communication system ?

  • (A). Pager
  • (B). Cellular phone
  • (C). Fax machine
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    20. Which of the following factor limits the channel capacity C?

  • (A). Bandwidth of channel
  • (B). Noise signal
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

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