Z3D153 - 2016 Edit Code 3, Volume 2 Part 1

20 Questions | Total Attempts: 96

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Z3D153 Quizzes & Trivia

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Questions and Answers
  • 1. 
    Which US government agency divides the radio frequency spectrum into different bands?
    • A. 

      Federal Aviation Agency.

    • B. 

      American National Standard Institute.

    • C. 

      Federal Communications Commission (FCC).

    • D. 

      Institute of Electrical & Electronics Engineers, Inc.

  • 2. 
    High-frequency (HF) transmissions are normally conducted in which two operating modes?
    • A. 

      Frequency modulation (FM) and independent sidebands (ISB).

    • B. 

      Continuous wave (CW) and amplitude modulation (AM).

    • C. 

      Single side band (SSB) and FM.

    • D. 

      SSB and ISB.

  • 3. 
    Which frequency band is most susceptible to jamming?
    • A. 

      Low frequency (LF).

    • B. 

      Medium frequency (MF).

    • C. 

      High frequency (HF).

    • D. 

      Very high frequency (VHF).

  • 4. 
    The ability of a receiver to reproduce the signal of a very weak station is characteristic of a receiver’s
    • A. 

      Fidelity.

    • B. 

      Capacity.

    • C. 

      Sensitivity.

    • D. 

      Selectivity.

  • 5. 
    The ability of a receiver to reproduce the input signal accurately is characteristic of its
    • A. 

      Fidelity.

    • B. 

      Capacity.

    • C. 

      Sensitivity.

    • D. 

      Selectivity.

  • 6. 
    A combination transmitter and receiver, built as a single unit and shares common tuned circuits, is called a
    • A. 

      Transmitter.

    • B. 

      Transceiver.

    • C. 

      Receiver.

    • D. 

      Coupler.

  • 7. 
    Conductor material resistance in a transmission line leads to this type of loss.
    • A. 

      Copper.

    • B. 

      Radiation.

    • C. 

      Inductive.

    • D. 

      Skin-effect.

  • 8. 
    The amount of skin-effect loss is directly proportional to the
    • A. 

      Line length.

    • B. 

      Frequency.

    • C. 

      Voltage level.

    • D. 

      Resistive loss.

  • 9. 
    Leakage loss in a transmission line is minimized by using a
    • A. 

      Thinner conductor.

    • B. 

      Thicker conductor.

    • C. 

      Very low-resistance dielectric.

    • D. 

      Very high-resistance dielectric.

  • 10. 
    A transmission line that consists of a center conductor, placed inside a rigid metal tube that functions as the outer shield, is called
    • A. 

      Flexible coaxial cable.

    • B. 

      Rigid coaxial cable.

    • C. 

      Waveguide.

    • D. 

      Twin lead.

  • 11. 
    A waveguide is a type of transmission line that you would use
    • A. 

      When the frequencies are so high that their wavelength is miniscule.

    • B. 

      To transmit on frequencies too low for ground propagation.

    • C. 

      For high power at frequencies up to 30 megahertz (MHz) primarily.

    • D. 

      To receive television frequencies over the air.

  • 12. 
    All statements concerning waveguides are true except
    • A. 

      Their outer surface will arc from being very slightly damaged.

    • B. 

      Their conductive material construction is easily dented.

    • C. 

      Their effectiveness is hindered by moisture.

    • D. 

      They can be destroyed by corrosion.

  • 13. 
    Which two transmission line properties determine its characteristic impedance (ZO)?
    • A. 

      Inductance and resistance.

    • B. 

      Inductance and capacitance.

    • C. 

      Resistance and capacitance.

    • D. 

      Length and type of shielding.

  • 14. 
    This is the correct statement concerning a wavelength.
    • A. 

      Wavelength is inversely related to frequency.

    • B. 

      Wavelength is directly related to frequency.

    • C. 

      Wavelength is determined by the line length.

    • D. 

      Wavelength is expressed in lambdas.

  • 15. 
    Determine the wavelength of a 250 megahertz (MHz) signal.
    • A. 

      12.0 meters.

    • B. 

      3.0 meters.

    • C. 

      1.5 meters.

    • D. 

      1.2 meters.

  • 16. 
    A nonresonant transmission line is one with
    • A. 

      Reflected waves.

    • B. 

      No reflected waves.

    • C. 

      Maximum voltage across its open termination.

    • D. 

      Maximum voltage across its shorted termination.

  • 17. 
    When discussing resonant and nonresonant transmission lines,
    • A. 

      Resonant lines are often referred to as flat lines.

    • B. 

      Maximum power transfer results from a resonant line.

    • C. 

      Maximum power transfer results from a nonresonant line.

    • D. 

      Significant loss and damage to equipment results from using a nonresonant line.

  • 18. 
    This will likely result if a transmission line is terminated in an open.
    • A. 

      Signal loss would be negligible.

    • B. 

      Signal loss would be significant.

    • C. 

      Current would be maximum at the termination.

    • D. 

      Voltage would be minimum at the termination.

  • 19. 
    Direct waves are radio waves that travel
    • A. 

      Long distances with few interruptions.

    • B. 

      From point to point along the Earth’s surface.

    • C. 

      No more than 20 miles to the receive antenna.

    • D. 

      Through the air in a straight line from transmitter to receiver.

  • 20. 
    Radio waves that travel near the Earth’s surface are called
    • A. 

      Earth waves.

    • B. 

      Global waves.

    • C. 

      Ground waves.

    • D. 

      Terrestrial waves.