Gibilisco - Wireless And Personal Communications Systems

29 Questions | Total Attempts: 210

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Communication Quizzes & Trivia

Questions and Answers
  • 1. 
    A network that employs one central computer and multiple personal computers is called
    • A. 

      A wireless network.

    • B. 

      A local area network.

    • C. 

      A client-server network.

    • D. 

      A peer-to-peer network.

  • 2. 
    In order for a receiver to render a digitally encrypted signal intelligible, that receiver must
    • A. 

      Have a directional antenna.

    • B. 

      Have a biometric security system.

    • C. 

      Have a decryption key.

    • D. 

      Be licensed by the government.

  • 3. 
    Which of the following devices or systems is not wireless?
    • A. 

      An SWL station

    • B. 

      An amateur radio station

    • C. 

      A cordless phone set

    • D. 

      A computer with a telephone modem

  • 4. 
    Eavesdropping of a wireless link
    • A. 

      Requires digital encryption.

    • B. 

      Requires a decryption key.

    • C. 

      Is difficult or impossible to detect.

    • D. 

      Includes all of the above.

  • 5. 
    In the United States, a license is required for
    • A. 

      Using a receiver on amateur radio frequencies.

    • B. 

      Transmitting on amateur radio frequencies.

    • C. 

      Using cordless phone sets.

    • D. 

      Using cell phone sets.

  • 6. 
    In a LEO satellite system, the repeaters are located
    • A. 

      In space.

    • B. 

      At strategic locations in most countries of the world.

    • C. 

      At the north and south geographic poles.

    • D. 

      Over the equator.

  • 7. 
    In a geostationary satellite link, the repeater is located
    • A. 

      On a buoy in the ocean.

    • B. 

      At strategic locations in most countries of the world.

    • C. 

      At the north and south geographic poles.

    • D. 

      Over the equator.

  • 8. 
    The term shortwave, in reference to radio, refers to signals having wavelengths of approximately
    • A. 

      10 mm to 100 mm.

    • B. 

      100 mm to 1 m.

    • C. 

      1 m to 10 m.

    • D. 

      10 m to 100 m.

  • 9. 
    Which of the following is illegal to do in the United States using a ham radio station?
    • A. 

      Advertise used cars for sale

    • B. 

      Transmit Morse code

    • C. 

      Receive outside the amateur radio bands

    • D. 

      Receive signals without a license

  • 10. 
    A file server is
    • A. 

      A sensitive radio receiver equipped with D/A conversion.

    • B. 

      A radio transmitter equipped with digital signal processing (DSP).

    • C. 

      A central computer in a local area network.

    • D. 

      A repeater in a LEO satellite system.

  • 11. 
    A device consisting of a receiver and transmitter in the same case or enclosure, and commonly used for wireless communications, is called
    • A. 

      A file server.

    • B. 

      A transceiver.

    • C. 

      A transverter.

    • D. 

      An encoder/decoder.

  • 12. 
    End-to-end encryption provides
    • A. 

      Maximum range in a wireless LAN.

    • B. 

      A higher degree of security than wireless-only encryption.

    • C. 

      Simultaneous transmission and reception in an amateur radio station.

    • D. 

      An easy means for hackers to clone cell phone sets.

  • 13. 
    A LAN in which each computer has more or less equal status, and in which each computerstores its own data, is known as a
    • A. 

      Wireless router.

    • B. 

      Wide-area LAN.

    • C. 

      LAN topology.

    • D. 

      Peer-to-peer LAN.

  • 14. 
    With respect to security, the term mil spec refers to
    • A. 

      Wireless-only encryption.

    • B. 

      A peer-to-peer network.

    • C. 

      The use of a wireless router.

    • D. 

      The highest obtainable level of security.

  • 15. 
    A radio signal is considered to be in the shortwave band if its frequency is which of thefollowing:
    • A. 

      5 MHz

    • B. 

      50 MHz

    • C. 

      500 MHz

    • D. 

      Any of the above

  • 16. 
    In a cellular network, the region covered by a single base station is called a
    • A. 

      Zone.

    • B. 

      Cell.

    • C. 

      Radius.

    • D. 

      Link.

  • 17. 
    An advantage of a conventional hard-wired telephone over a cell phone is the fact that a hard-wired phone set
    • A. 

      Affords better privacy.

    • B. 

      Offers greater portability.

    • C. 

      Is more convenient for use around the house.

    • D. 

      Employs digital encryption.

  • 18. 
    An advantage of a cell phone over a hard-wired phone is the fact that a cell phone set
    • A. 

      Affords better privacy.

    • B. 

      Costs less.

    • C. 

      Offers better mobility.

    • D. 

      Provides higher data speed.

  • 19. 
    In a two-way communications system with full duplex,
    • A. 

      Either party can hear the other at all times.

    • B. 

      A cell phone transmits on two frequencies at the same time.

    • C. 

      End-to-end encryption is necessary.

    • D. 

      A file server or router is necessary.

  • 20. 
    An advantage of LEO satellite systems over geostationary satellite systems is the fact that
    • A. 

      The latency is much greater with LEO satellite systems.

    • B. 

      The equatorial regions are covered by LEO satellite systems, but not by geostationary satellite systems.

    • C. 

      The regions near the geographic poles are covered by LEO satellite systems, but not by geostationary satellite systems.

    • D. 

      All of the above are advantages of LEO satellite systems over geostationary satellite systems.

  • 21. 
    Infrared and optical wireless links work best:
    • A. 

      Over distances exceeding 1000 miles.

    • B. 

      On a line of sight.

    • C. 

      At low radio frequencies.

    • D. 

      In situations with high levels of noise.

  • 22. 
    A noise blanker can improve the quality of:
    • A. 

      Radio reception.

    • B. 

      Radio transmission.

    • C. 

      Infrared reception.

    • D. 

      Infrared transmission.

  • 23. 
    Noise in a wireless receiver can be minimized by:
    • A. 

      Raising the temperature to very high values.

    • B. 

      Reducing the temperature to very low values.

    • C. 

      Maximizing the amplification.

    • D. 

      Minimizing the relative humidity.

  • 24. 
    As the data speed increases in a wireless system, all other factors being equal:
    • A. 

      The signal bandwidth increases.

    • B. 

      The signal bandwidth decreases.

    • C. 

      The overall noise level increases.

    • D. 

      The overall noise level decreases. The overall noise level decreases. The overall noise leveThe overall noise level decreases.l decreases.

  • 25. 
    In general, as the noise level in a wireless system increases:
    • A. 

      Stronger incoming signals are needed to overcome it.

    • B. 

      Weaker signals can be received.

    • C. 

      The temperature of the system rises.

    • D. 

      The bandwidth of the system increases.

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