Term
16. (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. |
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17. (403) What is the inclination angle of a polar orbit?
a. 0 degrees.
b. 45 degrees.
c. 90 degrees.
d. 180 degrees. |
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Definition
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Term
18. (404) What are the two types of communications satellites?
a. Active and passive.
b. Active and real-time.
c. Delay and passive.
d. Delay and real-time. |
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Definition
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Term
19. (404) Which satellite reflects signals transmitted toward it?
a. Active.
b. Delay.
c. Passive.
d. Real-time. |
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Definition
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Term
20. (404) An advantage of passive satellites is that they
a. have a larger transmitter power.
b. have more sensitive equipment.
c. operate as repeater stations in space.
d. operate over a wider-frequency range. |
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Definition
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Term
21. (404) What is the time delay of a real-time satellite?
a. 0.1 seconds.
b. 0.6 seconds.
c. 1.0 seconds.
d. 6.0 seconds. |
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Definition
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Term
22. (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). |
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Definition
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Term
23. (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). |
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Definition
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Term
24. (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. |
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Definition
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Term
25. (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. |
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Definition
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Term
26. (407) Solar time is based on
a. atomic clock oscillations.
b. apparent constellation movement.
c. the moon’s rotation about the sun.
d. the apparent motion of the sun in the sky. |
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Definition
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Term
27. (407) An atomic time scale is based on the frequency of which type of oscillator?
a. Pendulum.
b. Crystal.
c. Quartz.
d. Cesium. |
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Definition
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Term
28. (408) On what kind of clock system is coordinated universal time based?
a. Amplitude modulation and pulse modulation.
b. Daylight saving.
c. 24-hour.
d. 12-hour. |
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Definition
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Term
29. (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. |
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Definition
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Term
30. (409) 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. |
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Definition
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Term
31. (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. |
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Definition
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Term
32. (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. |
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Definition
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Term
33. (411) Which type of modems transmits RF signals over coaxial cable?
a. Voice.
b. Cable.
c. Radio.
d. Wireless. |
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Definition
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Term
34. (412) 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. |
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Definition
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Term
35. (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. Code division.
d. Time division. |
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Definition
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Term
36. (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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Definition
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