3D153 Volume 3 UREs

50 Questions | Total Attempts: 270

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3D153 Quizzes & Trivia

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Questions and Answers
  • 1. 
    Which of the following is not one of the three distinct elements that work together to make satellite communication (SATCOM) possible?
    • A. 

      Space segment.

    • B. 

      Control segment.

    • C. 

      Payload segment.

    • D. 

      Terminal segment.

  • 2. 
    Which of the following is not a function of the (satellite communication) SATCOM control segment?
    • A. 

      Spacecraft control.

    • B. 

      Network control.

    • C. 

      Payload control.

    • D. 

      Ground control.

  • 3. 
    Which term describes the longest distance across an elliptical orbit?
    • A. 

      Minor axis.

    • B. 

      Major axis.

    • C. 

      Apogee.

    • D. 

      Perigee.

  • 4. 
    What is the inclination angle of a polar orbit?
    • A. 

      0°.

    • B. 

      45°

    • C. 

      90°.

    • D. 

      180°.

  • 5. 
    Which are the two types of communications satellites?
    • A. 

      Delay and passive.

    • B. 

      Active and passive.

    • C. 

      Delay and real-time.

    • D. 

      Active and real-time.

  • 6. 
    Which satellite reflects signals transmitted toward it?
    • A. 

      Delay.

    • B. 

      Active.

    • C. 

      Passive.

    • D. 

      Real-time.

  • 7. 
    Which of the following satellite look angle methods is provided by (satellite communication SATCOM planners?
    • A. 

      Programmed ground terminal.

    • B. 

      Satellite access authorization.

    • C. 

      Computer based application.

    • D. 

      Satellite slide rule.

  • 8. 
    Which satellite access technique is being used when all channels are pooled and used by any station according to its instantaneous traffic load?
    • A. 

      Code division multiple access (CDMA).

    • B. 

      Time division multiple access (TDMA).

    • C. 

      Demand assigned multiple access (DAMA).

    • D. 

      Frequency division multiple access (FDMA).

  • 9. 
    Conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC) are resolved by the
    • A. 

      Joint Staff.

    • B. 

      Combatant commander (COCOM).

    • C. 

      Consolidated Space Operations Center (CSOC).

    • D. 

      Defense Information Systems Agency Operations Control Complex (DOCC).

  • 10. 
    One of the functions of the telecommunication certification office is to
    • A. 

      Assign a circuit number to the telecommunications service request.

    • B. 

      Maintain case files on all major command (MAJCOM) circuits.

    • C. 

      Ensure the user agency is prepared to pay for the service.

    • D. 

      Review the circuit priority against mission needs.

  • 11. 
    Telecommunications service orders are issued by the
    • A. 

      Department of Defense (DOD).

    • B. 

      User’s technical control facility.

    • C. 

      National Communications System (NCS).

    • D. 

      Defense Information Systems Agency (DISA).

  • 12. 
    Astronomical time is based on
    • A. 

      Atomic clock oscillations.

    • B. 

      Apparent constellation movement.

    • C. 

      The moon’s rotation about the earth.

    • D. 

      The apparent motion of the sun in the sky.

  • 13. 
    What time scale gives us a universally agreed to standard time scale with the stability and accuracy of atomic time and synchronous operation with the earth’s motion about the sun we can depend on?
    • A. 

      Atomic time.

    • B. 

      Mean solar time.

    • C. 

      Astronomical time.

    • D. 

      Coordinated universal time.

  • 14. 
    What two factors cause a quartz oscillator’s resonant frequency to drift?
    • A. 

      Humidity and aging.

    • B. 

      Temperature and aging.

    • C. 

      Humidity and operating frequency.

    • D. 

      Temperature and operating frequency.

  • 15. 
    The operation of the atomic clock is based on the phenomenon that
    • A. 

      Crystals resonate when an electric charge is applied.

    • B. 

      Atoms release energy at a particular resonant frequency.

    • C. 

      Atoms are sensitive to temperature and directional effects.

    • D. 

      When atoms are split they produce predictable nuclear reactions.

  • 16. 
    To determine the number of hours coordinated universal time (UTC) differs from your local time, you must determine the number of time zones between your location and the location of the zero
    • A. 

      Median.

    • B. 

      Latitude.

    • C. 

      Parallel.

    • D. 

      Meridian.

  • 17. 
    Coordinated universal time (UTC) is based on what kind of clock system?
    • A. 

      12-hour.

    • B. 

      24-hour.

    • C. 

      Astronomical.

    • D. 

      Amplitude modulation and pulse modulation.

  • 18. 
    A number of organizations can maintain accurate time-of-day clocks by referencing a standard time interval of one
    • A. 

      Second.

    • B. 

      Minute.

    • C. 

      Hour.

    • D. 

      Day.

  • 19. 
    The agency responsible for coordinated universal time (UTC) is the
    • A. 

      United States Naval Observatory (USNO).

    • B. 

      International Bureau of Weights and Measures (BIPM).

    • C. 

      Precision Measurement Equipment Laboratory (PMEL).

    • D. 

      National Institute of Standards and Technology (NIST).

  • 20. 
    What is multiplexing?
    • A. 

      Transmitting one signal over multiple transmission paths.

    • B. 

      Transmitting one signal multiple times over a single transmission path.

    • C. 

      Combining multiple information channels onto a common transmission medium.

    • D. 

      Combining multiple signals for transmission over separate, individual transmission paths.

  • 21. 
    What specifically does wavelength division multiplexing assign each incoming optical signal?
    • A. 

      Pseudorandom code.

    • B. 

      Frequency of light.

    • C. 

      Radio frequency.

    • D. 

      Time slot.

  • 22. 
    Which multiplexing division technique samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?
    • A. 

      Wavelength.

    • B. 

      Frequency.

    • C. 

      Code.

    • D. 

      Time.

  • 23. 
    Which of the following relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm?
    • A. 

      Controlled diphase.

    • B. 

      Non-return to zero.

    • C. 

      Forward error correction.

    • D. 

      Quadrature phase shift keying (QPSK).

  • 24. 
    Which SATCOM system module is used to produce the final transmit frequency?
    • A. 

      Up converter.

    • B. 

      Modulator.

    • C. 

      Amplifier.

    • D. 

      Antenna.

  • 25. 
    Which type of power amplifier uses semiconductor transistors designed for microwave and higher frequency RF operation?
    • A. 

      Klystron.

    • B. 

      Solid state.

    • C. 

      Traveling wave tube amplifier.

    • D. 

      Metal oxide field-effect transistor (MOSFET).