3d153v2 CDC Unit Review

100 Questions | Total Attempts: 329

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3d153v2 CDC Unit Review

100 Question Test CDC Unit Review, Volume 2


Questions and Answers
  • 1. 
    Equipment used for generating, amplifying, and transmitting RF carrier is collectively called
    • A. 

      A receiver.

    • B. 

      An antenna.

    • C. 

      A transmitter.

    • D. 

      A transmission line.

  • 2. 
    What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce voltage in the antenna?
    • A. 

      Reproduction

    • B. 

      Reception

    • C. 

      Detection

    • D. 

      Selection

  • 3. 
    The ability to reproduce the input signal accurately is the characteristics of the receiver's
    • A. 

      Fidelity

    • B. 

      Capacity

    • C. 

      Sensetivity

    • D. 

      Selectivity

  • 4. 
    A combination of a transmitter and receiver that is built as a single unit and sharing common tuned circuits is called a
    • A. 

      Transmitter

    • B. 

      Transceiver

    • C. 

      Receiver

    • D. 

      Coupler

  • 5. 
    Which of the following cannot be performed by the transceiver's computerized components and micro-circuitry?
    • A. 

      Specific equipment faults

    • B. 

      Internal equipment tests

    • C. 

      Internal calibrations

    • D. 

      Repair itself

  • 6. 
    A transmission line that consists of a center conductor placed inside a metal tube functioning as the outer tube is called a
    • A. 

      Flexible coaxial cable

    • B. 

      Rigid coaxial cable

    • C. 

      Waveguide

    • D. 

      Twin lead

  • 7. 
    Which selection best describes the term "cutoff frequency" when discussing the transmission line properties? XL = XL XC= XC
    • A. 

      The frequency where XL becomes so low that the signal is shunted

    • B. 

      The frequency where XC causes the signal to be shunted

    • C. 

      The lowest frequency that the line can pass successfully

    • D. 

      The frequency at which standing waves are maximum

  • 8. 
    Using figure 1-10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz
    • A. 

      12.0 meters

    • B. 

      3.0 meters

    • C. 

      1.5 meters

    • D. 

      1.2 meters

  • 9. 
    Using figure 1-10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.
    • A. 

      8.33 meters

    • B. 

      8.33 wavelengths

    • C. 

      83.3 meters

    • D. 

      83.3 wavelengths

  • 10. 
    A nonresonant transmission line is a line
    • A. 

      Having reflected waves

    • B. 

      Having no reflected waves

    • C. 

      With maximum voltage across its open termination

    • D. 

      With a maximum voltage across its shorted termination

  • 11. 
    If a transmission line is terminated in a short,
    • A. 

      Current is at maximum and voltage at minimum at the termination

    • B. 

      Current is at minimum and voltage at maximum at the termination

    • C. 

      There would be a nominal amount of signal gain

    • D. 

      The line would be nonresonant

  • 12. 
    In a basic communication system, what converts radio frequency (RF) energy's current oscillation into electric and magnetic fields of force?
    • A. 

      Antenna

    • B. 

      Coupler

    • C. 

      Transmitter

    • D. 

      Transmission lines

  • 13. 
    The concept that alternation current (AC) changes in magnitude and reverses its direction during each cycle is
    • A. 

      An unproved hypothesis

    • B. 

      The definition of propogation

    • C. 

      What makes radio transmission possible

    • D. 

      What led to the discovery of direct current

  • 14. 
    If the electric field component travels in a plane perpendicular to the Earth's surface, the radio wave is
    • A. 

      Magnetically polarized

    • B. 

      Horizontally polarized

    • C. 

      Circularly polarized

    • D. 

      Vertically polarized

  • 15. 
    What types of polarization do satellite terminals transmit and receive?
    • A. 

      Transmit horizontal and receive vertical polarizations

    • B. 

      Transmit vertical and receive horizontal polarizations

    • C. 

      Transmit right hand and receive left hand circular polarizations

    • D. 

      Transmit left hand and receive right hand circular polarizations

  • 16. 
    What measurement is used to determine whether an antenna is resonant at a particular frequency?
    • A. 

      Distortion

    • B. 

      Standing wave ratio

    • C. 

      Signal-to-noise ratio

    • D. 

      Percent of modulation

  • 17. 
    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

  • 18. 
    The standard used to measure the radiating effectiveness (gain) of an antenna system is the
    • A. 

      Marconi antenna

    • B. 

      Isotropic antenna

    • C. 

      Hertz antenna

    • D. 

      Whip antenna

  • 19. 
    What does the effectiveness of an entire transmitting and receiving system depend largely upon?
    • A. 

      Impedance matching

    • B. 

      Antenna distance

    • C. 

      Antenna properties

    • D. 

      Line characteristics

  • 20. 
    Which antenna radiates radio energy in a circular pattern?
    • A. 

      Omnidirectional

    • B. 

      Unidirectional

    • C. 

      Bidirectional

    • D. 

      Directional

  • 21. 
    Which antenna type is usually used on long-range, point-to-point circuits where the concentrated radio energy is needed for circuitry reliability?
    • A. 

      Omnidirectional

    • B. 

      Unidirectional

    • C. 

      Bidirectional

    • D. 

      Circular

  • 22. 
    Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a
    • A. 

      Reflector

    • B. 

      Hertz antenna

    • C. 

      Marconi antenna

    • D. 

      Vertical monopole

  • 23. 
    A long-wire's takeoff angle depends on the antenna's
    • A. 

      Length

    • B. 

      Directivity

    • C. 

      Front-to-back ratio

    • D. 

      Standing wave ratio

  • 24. 
    All antennas used in satellite communications are designed to be
    • A. 

      Circular directional

    • B. 

      Omnidirectional

    • C. 

      Bidirectional

    • D. 

      Directional

  • 25. 
    A common satellite antenna is the
    • A. 

      Whip

    • B. 

      Discone

    • C. 

      Parabolic

    • D. 

      Long-wire