Vol3 CDC 3D153 URE2

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

Amplitude modulation and pulse modulation

Daylight savings

24-hour

12-hour

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.

3. (404) Which satellite reflects signals transmitted toward it?

Active

Delay

Passive

Real-time

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

Degrees

Seconds

Minutes

Nautical miles

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

Pendulum

Crystal

Quartz

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.

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)

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

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

Active and Passive

Active and Real-time

Delay and Real-time

Delay 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.

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

0 degrees

45 degrees

90 degrees

180 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.

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

Pseudorandom code.

Frequency of light.

Radio frequency.

Time slot

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

Apogee

Perigee

Major axis

Minor axis

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

0.1 seconds

0.6 seconds

1 second

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

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.

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.

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

Voice

Cable

Radio

Wireless

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)

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

Vol3 CDC 3D153 Ure2