Wireless Communication and Antennas Quiz
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Questions and Answers

What is the primary medium used for transmitting information in optical fiber technology?

  • Aluminum strip
  • Air
  • Glass or plastic fibers (correct)
  • Copper wire

    • Which type of wireless communication is based on radio waves?

  • Fiber optic communication
  • AM and FM radio (correct)
  • Microwave communication
  • Infrared communication

    • What is one characteristic of microwave communication compared to radio waves?

  • Used primarily for short-distance communication
  • Requires alignment of antennas (correct)
  • Penetrates through buildings
  • Does not require physical links

    • Infrared waves are often used in which of the following applications?

    <p>TV remotes</p> Signup and view all the answers

    What defines a Log Periodic Antenna?

    <p>Utilizes a series of dipoles spaced by a logarithmic function</p> Signup and view all the answers

    What does a traveling wave in a Traveling Wave Antenna represent?

    <p>A constant disturbance</p> Signup and view all the answers

    Which type of antenna is primarily associated with microwave transmission?

    <p>Microwave Antennas</p> Signup and view all the answers

    What frequency range does sky wave propagation use?

    <p>3-30 MHz</p> Signup and view all the answers

    What is a key limitation of infrared communication?

    <p>Requires clear line of sight without obstacles</p> Signup and view all the answers

    Which multiplexing technique divides time into non-overlapping time slots?

    <p>Time-division multiplexing (TDM)</p> Signup and view all the answers

    Which of the following statements best describes the purpose of multiplexing?

    <p>To enable multiple signals to be sent simultaneously over a single channel</p> Signup and view all the answers

    What is the primary advantage of frequency-division multiplexing (FDM)?

    <p>It allows users to share the same frequency channel without interference</p> Signup and view all the answers

    What characterizes space wave propagation?

    <p>It is primarily used in satellite communication</p> Signup and view all the answers

    What is the frequency range for Extremely Low Frequency (ELF)?

    <p>3 KHz to 30 KHz</p> Signup and view all the answers

    Which frequency range corresponds to Ultra High Frequency (UHF)?

    <p>300 MHz to 3 GHz</p> Signup and view all the answers

    What defines wave propagation in terms of its fields?

    <p>Superimposed oscillations of electric and magnetic fields</p> Signup and view all the answers

    What is the wavelength range for Very High Frequency (VHF)?

    <p>10 m to 1 m</p> Signup and view all the answers

    Ground wave propagation primarily operates effectively in which frequency range?

    <p>Less than 1 MHz</p> Signup and view all the answers

    Which frequency range is classified as High Frequency (HF)?

    <p>3 MHz to 30 MHz</p> Signup and view all the answers

    What best describes simplex transmission?

    <p>Data can only flow in one direction.</p> Signup and view all the answers

    What type of antennas are used for Ground Wave propagation?

    <p>Antennas of the order of the wavelength</p> Signup and view all the answers

    Which of the following correctly defines full-duplex transmission?

    <p>Data flows in both directions simultaneously.</p> Signup and view all the answers

    What is the frequency range for Extremely High Frequency (EHF)?

    <p>30 GHz to 300 GHz</p> Signup and view all the answers

    What characterizes asynchronous transmission?

    <p>Each character is preceded by a start bit and may have stop bits.</p> Signup and view all the answers

    In synchronous transmission, how is data organized?

    <p>Data is divided into frames, each with flags.</p> Signup and view all the answers

    Which of the following is an example of guided media?

    <p>Twisted pair cables.</p> Signup and view all the answers

    What is the purpose of twisted pair cables?

    <p>To isolate and reduce electromagnetic interference.</p> Signup and view all the answers

    What is a key feature of coaxial cables?

    <p>They can carry multiple sets of channels simultaneously.</p> Signup and view all the answers

    Which of the following statements about serial data transmission is true?

    <p>Data is sent in a specific order one after another.</p> Signup and view all the answers

    What does Carrier Sense in CSMA/CD refer to?

    <p>Listening for a signal on the network before transmitting data.</p> Signup and view all the answers

    How does CSMA/CA differ from CSMA/CD?

    <p>CSMA/CA signals intention to transmit, while CSMA/CD detects existing transmissions.</p> Signup and view all the answers

    What is the main advantage of token passing as a media access method?

    <p>It prevents collisions by allowing only the computer with the token to transmit.</p> Signup and view all the answers

    In a demand priority system, what is required before a terminal can transmit data?

    <p>The terminal must request permission from the active hub.</p> Signup and view all the answers

    What happens when a collision is detected in CSMA/CD?

    <p>The stations involved stop transmitting and wait a random time to retransmit.</p> Signup and view all the answers

    What is a characteristic of the demand priority access method?

    <p>It requires a hub to grant access before transmission.</p> Signup and view all the answers

    Which statement about Carrier Sense Multiple Access (CSMA) is true?

    <p>CSMA can detect collisions but does not prevent them.</p> Signup and view all the answers

    Which media access method provides a mechanism for prioritizing different stations?

    <p>Demand Priority</p> Signup and view all the answers

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