CDC 3D153 Volume 2 V2 (April 2013)

100 Questions | Total Attempts: 1973

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CDC Quizzes & Trivia

CDC 3D153 01 1206, Edit Code 02 (April 2013) Volume 2 Units 1-5 Unit 1: Antenna Theory Unit 2: Electromagnetic Wave Theory Unit 3: Transmission Security Techniques, Data Linking Concepts and Jam-Resistant Communications Unit 4: Other RF Transmission Systems Unit 5: High Frequency Communications


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 a voltage in the antenna?
    • A. 

      Reproduction.

    • B. 

      Reception.

    • C. 

      Detection.

    • D. 

      Selection.

  • 3. 
    The ability of a receiver to reproduce the signal of a very weak station is the characteristic of the receiver’s
    • A. 

      Fidelity.

    • B. 

      Capacity.

    • C. 

      Sensitivity.

    • D. 

      Selectivity.

  • 4. 
    The ability to reproduce the input signal accurately is the characteristics of the receiver’s
    • A. 

      Fidelity.

    • B. 

      Capacity.

    • C. 

      Sensitivity.

    • D. 

      Selectivity.

  • 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. 
    Resistance of the conductor material in a transmission line leads to which type of loss?
    • A. 

      Copper.

    • B. 

      Radiation.

    • C. 

      Inductive.

    • D. 

      Skin-effect.

  • 7. 
    Leakage loss in a transmission line can be minimized by using a
    • A. 

      Thinner conductor.

    • B. 

      Thicker conductor.

    • C. 

      Very low-resistance dielectric.

    • D. 

      Very high-resistance dielectric.

  • 8. 
    A transmission line that consists of a center conductor placed inside a rigid metal tube functioning as the outer tube is called a
    • A. 

      Flexible coaxial cable.

    • B. 

      Rigid coaxial cable.

    • C. 

      Waveguide.

    • D. 

      Twin lead.

  • 9. 
    Which statement concerning waveguides is FALSE?
    • A. 

      Very slight damage to the external surface of a waveguide can cause arcing.

    • B. 

      Their conductive material construction is easily dented.

    • C. 

      Effectiveness of waveguides is hindered by moisture.

    • D. 

      Waveguides can be destroyed by corrosion.

  • 10. 
    What two properties of a transmission line determine its characteristic impedance?
    • A. 

      Inductance and resistance.

    • B. 

      Inductance and capacitance.

    • C. 

      Resistance and capacitance.

    • D. 

      Length and type of shielding.

  • 11. 
    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.

  • 12. 
    Which statement concerning line lengths is TRUE?
    • A. 

      Frequency and electrical length are inversely proportional.

    • B. 

      Frequency and physical length are directly proportional.

    • C. 

      With constant physical length, frequency and electrical length are directly related.

    • D. 

      With constant physical length, frequency and electrical length are inversely related.

  • 13. 
    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 maximum voltage across its shorted termination.

  • 14. 
    If a transmission line is terminated in an open, what will likely result?
    • A. 

      Signal loss would be negligible.

    • B. 

      There would be significant signal loss.

    • C. 

      Current would be at maximum at the termination.

    • D. 

      Voltage would be at minimum at the termination.

  • 15. 
    The concept that alternating current 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.

  • 16. 
    At what 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.

  • 17. 
    Which basic field detaches from the antenna and travels through space at great distances?
    • A. 

      Radiation.

    • B. 

      Induction.

    • C. 

      Gravitational.

    • D. 

      Electromotive.

  • 18. 
    Areas in which no antenna radiation pattern passes through are called
    • A. 

      Nulls.

    • B. 

      Lobes.

    • C. 

      Free space.

    • D. 

      Nonresonant.

  • 19. 
    If the electric field component travels in a plane perpendicular to the Earth’s surface, the radio wave is considered to be polarized
    • A. 

      Magnetically.

    • B. 

      Horizontally.

    • C. 

      Circularly.

    • D. 

      Vertically.

  • 20. 
    The actual range of frequencies within the antenna’s bandwidth is called the
    • A. 

      Wavelength.

    • B. 

      Operating zone.

    • C. 

      Frequency range.

    • D. 

      Bandwidth range.

  • 21. 
    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.

  • 22. 
    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.

  • 23. 
    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.

  • 24. 
    What does the overall effectiveness of an entire transmitting and receiving system depend largely upon?
    • A. 

      Impedance matching.

    • B. 

      Antenna distance.

    • C. 

      Antenna properties.

    • D. 

      Line characteristics.

  • 25. 
    Which antenna radiates radio energy equally well in all directions?
    • A. 

      Omni-directional.

    • B. 

      Uni-directional.

    • C. 

      Bi-directional.

    • D. 

      Directional.