Vol3 CDC 3D153 Ure2

21 Questions | Attempts: 156
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  • 1/21 Questions

    (408) On what kind of clock system is coordinated universal time based?

    • Amplitude modulation and pulse modulation
    • Daylight savings
    • 24-hour
    • 12-hour
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About This Quiz

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

CDC Quizzes & Trivia

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  • 2. 

    What is multiplexing?

    • Transmitting one signal over multiple transmission paths

    • Transmitting one signal multiple times over a single transmission path.

    • Combining multiple signals for transmission over a single transmission path.

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

    Correct Answer
    A. Combining multiple signals for transmission over a single transmission path.
  • 3. 

    (404) Which satellite reflects signals transmitted toward it?

    • Active

    • Delay

    • Passive

    • Real-time

    Correct Answer
    A. Passive
  • 4. 

    (406) When computing satellite look angles, ground distance on the earth’s surface is expressed in?

    • Degrees

    • Seconds

    • Minutes

    • Nautical miles

    Correct Answer
    A. Degrees
  • 5. 

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

    • Pendulum

    • Crystal

    • Quartz

    • Cesium

    Correct Answer
    A. Cesium
  • 6. 

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

    • Identical time code formats.

    • Different time code formats.

    • Synchronized timing

    • Offset timing.

    Correct Answer
    A. Synchronized timing
  • 7. 

    (405) What satellite access technique is being used when all channels are pooled and used by any station, according to its instantaneous traffic load?

    • Code division multiple access (CDMA)

    • Time division multiple access (TDMA)

    • Demand assigned multiple access (DAMA)

    • Frequency Division multiple access (FDMA)

    Correct Answer
    A. Demand assigned multiple access (DAMA)
  • 8. 

    (407) Solar time is based on?

    • Atomic clock oscillators

    • Apparent constellation movement.

    • The moon's rotation around the sun

    • The apparent motion of the sun in the sky

    Correct Answer
    A. The apparent motion of the sun in the sky
  • 9. 

    (404) What are the two types of communications satellites?

    • Active and Passive

    • Active and Real-time

    • Delay and Real-time

    • Delay and Passive

    Correct Answer
    A. Active and Passive
  • 10. 

    (410) What two factors cause a quartz oscillator’s resonant frequency to drift?

    • Humidity and aging.

    • Temperature and aging.

    • Humidity and operating frequency.

    • Temperature and operating frequency.

    Correct Answer
    A. Temperature and aging.
  • 11. 

    (403) What is the inclination angle of a polar orbit?

    • 0 degrees

    • 45 degrees

    • 90 degrees

    • 180 degrees

    Correct Answer
    A. 90 degrees
  • 12. 

    (410) The operation of the atomic clock is based on the phenomenon that

    • Crystals resonate when an electric charge is applied.

    • Atoms release energy at a particular resonant frequency.

    • Atoms are sensitive to temperature and directional effects.

    • When atoms are split they produce predictable nuclear reactions.

    Correct Answer
    A. Atoms release energy at a particular resonant frequency.
  • 13. 

    (412) Wavelength division multiplexing assigns each incoming optical signal to a specific?

    • Pseudorandom code.

    • Frequency of light.

    • Radio frequency.

    • Time slot

    Correct Answer
    A. Frequency of light.
  • 14. 

    (403) The closest point of orbit that a satellite comes to the Earth is called the?

    • Apogee

    • Perigee

    • Major axis

    • Minor axis

    Correct Answer
    A. Perigee
  • 15. 

    What is the time delay of a real-time satellite?

    • 0.1 seconds

    • 0.6 seconds

    • 1 second

    • 6 seconds

    Correct Answer
    A. 0.6 seconds
  • 16. 

    (406) One degree of arc on the Earth’s surface equals

    • One statute mile

    • One nautical mile

    • 69 statute miles

    • 69 nautical miles

    Correct Answer
    A. 69 statute miles
  • 17. 

    (409) The international agency responsible for coordinated universal time (UTC) is the?

    • United States Naval Observatory

    • International Bureau of Weights and Measures.

    • Precision Measurement Equipment Laboratory.

    • National Institute of Standards and Technology.

    Correct Answer
    A. International Bureau of Weights and Measures.
  • 18. 

    (404) An advantage of passive satellites is that they

    • Have a larger transmitter power

    • Have more sensitive equipment.

    • Operate as a repeater station in space

    • Operate over a wider-frequency range.

    Correct Answer
    A. Operate over a wider-frequency range.
  • 19. 

    (411) Which type of modems transmits RF signals over coaxial cable?

    • Voice

    • Cable

    • Radio

    • Wireless

    Correct Answer
    A. Cable
  • 20. 

    (405) What satellite access technique was the first multiple access method developed?

    • Code division multiple access (CDMA).

    • Time division multiple access (TDMA).

    • Demand assigned multiple access (DAMA).

    • Frequency Division Multiple Access (FDMA)

    Correct Answer
    A. Frequency Division Multiple Access (FDMA)
  • 21. 

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

    • Wavelength division

    • Frequency division

    • Time division

    • Code division

    Correct Answer
    A. Time division

Quiz Review Timeline (Updated): Mar 21, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
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  • Oct 23, 2012
    Quiz Created by
    Jayhuiz23
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