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 (B)</p> Signup and view all the answers

What defines a Log Periodic Antenna?

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

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

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

Which type of antenna is primarily associated with microwave transmission?

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

What frequency range does sky wave propagation use?

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

What is a key limitation of infrared communication?

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

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

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

What characterizes space wave propagation?

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

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

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

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

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

What defines wave propagation in terms of its fields?

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

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

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

Ground wave propagation primarily operates effectively in which frequency range?

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

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

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

What best describes simplex transmission?

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

Which of the following correctly defines full-duplex transmission?

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

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

<p>30 GHz to 300 GHz (D)</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. (B)</p> Signup and view all the answers

In synchronous transmission, how is data organized?

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

Which of the following is an example of guided media?

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

What is the purpose of twisted pair cables?

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

What is a key feature of coaxial cables?

<p>They can carry multiple sets of channels simultaneously. (B)</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. (C)</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. (B)</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. (B)</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. (D)</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. (D)</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. (A)</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. (B)</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. (B)</p> Signup and view all the answers

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

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

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