Set 2 Vol 2 Communication

30 Questions | Total Attempts: 31

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Communication Quizzes & Trivia

Questions and Answers
  • 1. 
    In a basic communication system, this is used to convert radio frequency (RF) current oscillation into electric and magnetic fields of force
    • A. 

      Antenna

    • B. 

      Transmitter

    • C. 

      Coupler

    • D. 

      Transmission lines

  • 2. 
    The concept where alternating current (AC) changes in magnitude, and reverses its direction during each cycle, is
    • A. 

      An unproven hypothesis

    • B. 

      The definition of propagation

    • C. 

      What makes radio transmission possible

    • D. 

      What led to the discovery of direct current (DC)

  • 3. 
    At which point do magnetic fields around a wire no longer have time to collapse completely between alternations?
    • A. 

      60 cycles per second (cps)

    • B. 

      120 cps

    • C. 

      10,000 cps

    • D. 

      15,000 cps

  • 4. 
    In radio-wave creation, which type of field detaches from the antenna and travels through space at great distances?
    • A. 

      Radiation.

    • B. 

      Induction

    • C. 

      Gravitational

    • D. 

      Electromotive

  • 5. 
    Which types of polarization do most satellite communication terminals transmit and receive?
    • A. 

      Transmit horizontal and receive vertical polarizations

    • B. 

      Transmit vertical and receive horizontal polarizations

    • C. 

      Transmit right-hand circular and receive left-hand circular polarizations

    • D. 

      Transmit left-hand circular and receive right-hand circular polarizations

  • 6. 
    A resonant antenna effectively radiates a radio signal for frequencies close to its designed frequency. Which percentage range, plus or minus, is it usually within?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 7. 
    The design frequency of a resonant antenna is 10 megahertz (MHz). What will be its frequency range?
    • A. 

      8–10 MHz

    • B. 

      9–11 MHz

    • C. 

      9.5–10.5 MHz

    • D. 

      9.8–10.2 MHz

  • 8. 
    The lowest frequency at which an antenna resonates is known as its
    • A. 

      Standing wave

    • B. 

      Fundamental

    • C. 

      Resonation

    • D. 

      Primary.

  • 9. 
    The ability of an antenna to both receive and transmit equally well is known as the antenna’s
    • A. 

      Bandwidth

    • B. 

      Resonance

    • C. 

      Reciprocity

    • D. 

      Effectiveness

  • 10. 
    This matching device is inserted to make a transmitter “think” it is connected to a low standing-wave ratio (SWR) antenna
    • A. 

      Stub

    • B. 

      Balun

    • C. 

      Coupler

    • D. 

      Terminating resistor

  • 11. 
    This matching device would be used to connect a 52-ohms RG–213 cable to an antenna with an impedance of 600-ohms.
    • A. 

      Balun.

    • B. 

      Coupler

    • C. 

      Reflector

    • D. 

      Terminating resistor

  • 12. 
    Which type of antenna radiates radio energy equally well in all directions?
    • A. 

      Omni-directional

    • B. 

      Uni-directional

    • C. 

      Bi-directional

    • D. 

      Directional

  • 13. 
    Add this device to make a long-wire antenna more directional
    • A. 

      Stub

    • B. 

      Balun

    • C. 

      Coupler

    • D. 

      Terminating resistor

  • 14. 
    Beam width of a directive antenna is measured at the
    • A. 

      Quarter-power point

    • B. 

      Half-power point

    • C. 

      Three-quarters power point

    • D. 

      Maximum value point

  • 15. 
    A dipole or long-wire antenna is an example of a
    • A. 

      Whip antenna

    • B. 

      Hertz antenna

    • C. 

      Marconi antenna

    • D. 

      Vertical monopole

  • 16. 
    This is one of the simplest and most functional antennas in use
    • A. 

      Quarter-wave vertical

    • B. 

      Half-wave dipole

    • C. 

      Inverted-V

    • D. 

      GRA–4

  • 17. 
    The minimum length of a long-wire antenna is
    • A. 

      One-quarter wavelength

    • B. 

      One-half wavelength

    • C. 

      One wavelength

    • D. 

      Two wavelengths

  • 18. 
    You should use this type of antenna to communicate over the horizon to an amphibious ship on the move or to a station up to 450 kilometers away
    • A. 

      Near-vertical incidence sky-wave

    • B. 

      Helical

    • C. 

      Inverted-V

    • D. 

      Inverted-L

  • 19. 
    How are most antennas designed that are used in satellite communications?
    • A. 

      Circular-directional

    • B. 

      Omni-directional

    • C. 

      Bi-directional

    • D. 

      Directional

  • 20. 
    Which type of polarization is used to radiate a signal using a helical satellite antenna?
    • A. 

      Horizontal

    • B. 

      Vertical

    • C. 

      Circular

    • D. 

      Linear

  • 21. 
    This type of antenna is used to transmit and receive microwave signals
    • A. 

      Horn

    • B. 

      Whip

    • C. 

      Helical

    • D. 

      Log-periodic

  • 22. 
    Where are aircraft antennas normally housed?
    • A. 

      Inside nonconductive radomes outside or flush with the fuselage

    • B. 

      Inside conductive radomes outside or flush with the fuselage

    • C. 

      Outside nonconductive radomes outside the fuselage

    • D. 

      Inside conductive radomes flush with the fuselage

  • 23. 
    At which vertical angles should the multi-hop, long-distance transmission be used in airborne antenna applications for frequencies in the upper portion of the high-frequency (HF) band?
    • A. 

      90 and 180 degrees

    • B. 

      60 and 90 degrees

    • C. 

      30 and 60 degrees

    • D. 

      5 and 30 degrees

  • 24. 
    This is the best way to orient line-of-sight (LOS) antennas
    • A. 

      Toward the true north bearing

    • B. 

      Away from the receiving station

    • C. 

      Away from the magnetic north bearing

    • D. 

      In a straight path to the receiving station

  • 25. 
    When siting a radio station, which type of foliage would have a more adverse effect on radio-wave propagation?
    • A. 

      Broadleaf trees

    • B. 

      Evergreen trees

    • C. 

      Swamp grass

    • D. 

      Sagebrush

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