advance-communication-system-mcqs - Set (1)

Correct Answer: Orange && Worng Answer: Red

1. For long distance communication via satellite the frequency ranges from

  • (A). 5 to 10 GHz
  • (B). 15 to 20 GHz
  • (C). 1 to 2 GHz
  • (D). 10 to 15 GHz
    • View Answer

    Explanation: Not Avilable

    2. The instrument used for measurement of height for an aircraft is

  • (A). Radar altimeter
  • (B). Radar speedometer
  • (C). Radar elevator
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    3. The range of mobile telephone is about :

  • (A). 50 Km
  • (B). 30 Km
  • (C). 40 Km
  • (D). 10 Km
    • View Answer

    Explanation: Not Avilable

    4. RADAR consist of :

  • (A). Antenna
  • (B). Transmitter
  • (C). Receiver
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    5. Radio waves have _____ frequency than microwave.

  • (A). Smaller
  • (B). Larger
  • (C). Very large
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    6. Ducting is caused due to _____ in version.

  • (A). Phase
  • (B). Temperature
  • (C). Phase/temperature
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    7. What is the number of satellite required for global communication ?

  • (A). 1
  • (B). 2
  • (C). 3
  • (D). 4
    • View Answer

    Explanation: Not Avilable

    8. Higher the frequency :

  • (A). Lower is the skip distance
  • (B). Skip distance does not change
  • (C). Higher is the skip distance
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    9. Synchronous satellite orbits the earth once in :

  • (A). 8 hr
  • (B). 12 hr
  • (C). 24 hr
  • (D). 1 hr
    • View Answer

    Explanation: Not Avilable

    10. An electronic calculator uses :

  • (A). Pencil cells
  • (B). Solar cells
  • (C). Both (a) and (b)
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    11. Geostationary satellites follow :

  • (A). Elliptical path
  • (B). Circular path
  • (C). Inclined elliptical path
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    12. A duplexer is a :

  • (A). Single side band filter
  • (B). Transmitter-receiver
  • (C). Balanced mixer
  • (D). RF amplifier
    • View Answer

    Explanation: Not Avilable

    13. In an AM wave, Amin=40V, Amax=60V, then modulation index is :

  • (A). 0.3
  • (B). 0.2
  • (C). 0.4
  • (D). 0.5
    • View Answer

    Explanation: Not Avilable

    14. PRF stands for :

  • (A). Power return factor
  • (B). Pulse return factor
  • (C). Pulse repetation frequency
  • (D). Pulse response frequency
    • View Answer

    Explanation: Not Avilable

    15. If Em=peak value of information signal, Ec=peak value of carrier signal, then modulation index(m) is given by :

  • (A). m = Ec/Em
  • (B). m = Ec.Em
  • (C). m = Ec+Em
  • (D). m = Em/Ec
    • View Answer

    Explanation: Not Avilable

    16. Sky waves are _____

  • (A). Horizontally polarized
  • (B). Vertically polarized
  • (C). Reflected from ionosphere
  • (D). Both (b) and (c)
    • View Answer

    Explanation: Not Avilable

    17. Space waves are :

  • (A). Horizontally polarized
  • (B). Vertically polarized
  • (C). Reflected from ionosphere
  • (D). Refracted from ionosphere
    • View Answer

    Explanation: Not Avilable

    18. FM broadcast lies in _____

  • (A). VHF band
  • (B). UHF band
  • (C). SHF band
  • (D). HF band
    • View Answer

    Explanation: Not Avilable

    19. The maximum usable frequency and critical frequency are related as :

  • (A). muf = fc cos θ
  • (B). muf = fc sec θ
  • (C). muf = fc sin θ
  • (D). muf = fc cosec θ
    • View Answer

    Explanation: Not Avilable

    20. The height of troposphere from the ground is nearly :

  • (A). 50 km
  • (B). 30 km
  • (C). 15 km
  • (D). 100 km
    • View Answer

    Explanation: Not Avilable

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