Vol3 CDC 3D153 Ure2
This is to be used as a study aid for the 3D153 CDC's.
- 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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