Vol3 CDC 3D153 Ure2

21 Questions | Total Attempts: 156

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CDC Quizzes & Trivia

This is to be used as a study aid for the 3D153 CDC's.


Questions and Answers
  • 1. 
    (403) The closest point of orbit that a satellite comes to the Earth is called the?
    • A. 

      Apogee

    • B. 

      Perigee

    • C. 

      Major axis

    • D. 

      Minor axis

  • 2. 
    (403) What is the inclination angle of a polar orbit?
    • A. 

      0 degrees

    • B. 

      45 degrees

    • C. 

      90 degrees

    • D. 

      180 degrees

  • 3. 
    (404) What are the two types of communications satellites?
    • A. 

      Active and Passive

    • B. 

      Active and Real-time

    • C. 

      Delay and Real-time

    • D. 

      Delay and Passive

  • 4. 
    (404) Which satellite reflects signals transmitted toward it?
    • A. 

      Active

    • B. 

      Delay

    • C. 

      Passive

    • D. 

      Real-time

  • 5. 
    (404) An advantage of passive satellites is that they
    • A. 

      Have a larger transmitter power

    • B. 

      Have more sensitive equipment.

    • C. 

      Operate as a repeater station in space

    • D. 

      Operate over a wider-frequency range.

  • 6. 
    What is the time delay of a real-time satellite?
    • A. 

      0.1 seconds

    • B. 

      0.6 seconds

    • C. 

      1 second

    • D. 

      6 seconds

  • 7. 
    (405) What satellite access technique was the first multiple access method developed?
    • A. 

      Code division multiple access (CDMA).

    • B. 

      Time division multiple access (TDMA).

    • C. 

      Demand assigned multiple access (DAMA).

    • D. 

      Frequency Division Multiple Access (FDMA)

  • 8. 
    (405) What 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. 
    (406) When computing satellite look angles, ground distance on the earth’s surface is expressed in?
    • A. 

      Degrees

    • B. 

      Seconds

    • C. 

      Minutes

    • D. 

      Nautical miles

  • 10. 
    (406) One degree of arc on the Earth’s surface equals
    • A. 

      One statute mile

    • B. 

      One nautical mile

    • C. 

      69 statute miles

    • D. 

      69 nautical miles

  • 11. 
    (407) Solar time is based on?
    • A. 

      Atomic clock oscillators

    • B. 

      Apparent constellation movement.

    • C. 

      The moon's rotation around the sun

    • D. 

      The apparent motion of the sun in the sky

  • 12. 
    (407) An atomic time scale is based on the frequency of which type of oscillator?
    • A. 

      Pendulum

    • B. 

      Crystal

    • C. 

      Quartz

    • D. 

      Cesium

  • 13. 
    (408) On what kind of clock system is coordinated universal time based?
    • A. 

      Amplitude modulation and pulse modulation

    • B. 

      Daylight savings

    • C. 

      24-hour

    • D. 

      12-hour

  • 14. 
    (409) The international agency responsible for coordinated universal time (UTC) is the?
    • A. 

      United States Naval Observatory

    • B. 

      International Bureau of Weights and Measures.

    • C. 

      Precision Measurement Equipment Laboratory.

    • D. 

      National Institute of Standards and Technology.

  • 15. 
    Uploading satellite control data, tracking ballistic missiles, and predicting satellite tracking coordinates are examples of missions where all parties involved must have?
    • A. 

      Identical time code formats.

    • B. 

      Different time code formats.

    • C. 

      Synchronized timing

    • D. 

      Offset timing.

  • 16. 
    (410) 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.

  • 17. 
    (410) 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.

  • 18. 
    (411) Which type of modems transmits RF signals over coaxial cable?
    • A. 

      Voice

    • B. 

      Cable

    • C. 

      Radio

    • D. 

      Wireless

  • 19. 
    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 signals for transmission over a single transmission path.

    • D. 

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

  • 20. 
    (412) What technique of multiplexing samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?
    • A. 

      Wavelength division

    • B. 

      Frequency division

    • C. 

      Time division

    • D. 

      Code division

  • 21. 
    (412) Wavelength division multiplexing assigns each incoming optical signal to a specific?
    • A. 

      Pseudorandom code.

    • B. 

      Frequency of light.

    • C. 

      Radio frequency.

    • D. 

      Time slot

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