EST 57

Which of the following is not an advantage of geosynchronous orbit?

• a. No need to switch from one satellite to another as satellites orbit overhead, therefore, no breaks of transmission due to switching times.

• b. High-altitude geosynchronous satellites can cover a much larger area

• c. Geosynchronous satellites require higher transmit powers and more sensitive receivers because of the longer distances and greater path loss.

• d. Satellite remains almost stationary in respect to a given earth station, therefore, expensive tracking equipment is not required at the earth stations.

Which of the following parameters (height of the satellite from earth, travel time, rotation period, and the satellite’s line of sight) refer to low-altitude satellite?

• a. 19,000 – 25,000 mi; 6,879 mi/hr; 24 hr; and 24-h availability time, respectively

• b. 6,000 – 12,000 mi; 12,189 mi/hr; 5 – 12 hr; and 2- 4 hr per orbit, respectively

• c. 100 – 300 mi; 17,500 mi/hr; 1 ½ hr, and ¼ or less per orbit, respective

• d. 50 – 95 mi; 25,600 mi/hr, ½ hr; and 1/8 or less per orbit, respectively

There are two primary classifications of communications satellite; one uses the angular momentum of its spinning body to provide roll and yaw relative to earth’s surface while an internal subsystem provides roll and yaw stabilization. What are they?

• a. gyroscopic satellites

• b. delayed repeater satellites

• c. passive and active satellites

• d. spinners and three-axis stabilizer satellites

How do radiation patterns or beams from a satellite antenna categorized?

• a. Spot

• b. Earth

• c. Zonal

• d. All of these

A ____________ satellite with an orbital period of one sidereal day or nominally, 24 h

• a. Bent-pipe satellite

• b. Processing satellite

• c. Geostationary satellite

• d. ANIK-D communications satellite

19,000 – 25,000 mi height; 6, 879 mi/hr travel time; 24-hr rotation; and 24-hr availability time belong to what satellite?

• a. Low-altitude satellites (circular orbit)

• b. Medium-altitude satellites (elliptical orbit)

• c. High-altitude satellites (geosynchronous orbit)

• d. GLONASS

An orbit when the satellite rotates in a path above the equator.

• a. Polar orbit

• b. Inclines orbit

• c. Equatorial orbit

• d. Geosynchronous orbit

Orbiting satellite system in Russia which means “lightning” or “news flash”, used for television broadcasting. It uses a highly inclined elliptical orbit with apogee at about 40,000 km and perigee at about 1,000 km

• a. Molniya system

• b. Molnya system

• c. Molnia system

• d. All are correct

Polar and inclined orbits refer to what?

• a. Any other orbital path, and rotation above the equator, respectively

• b. Any other orbital path, and rotation that takes over the north and south poles, respectively

• c. Rotation that takes over the north and south poles, and any other orbital path, respectively

• d. Rotation above the equator, and rotation that takes over the north and south poles, respectively

____________ means the farthest distance from earth a satellite orbit reaches while ____________ is the minimum distance.

• a. Apogee and perigee, respectively

• b. Perigee and apogee, respectively

• c. A and B are the same

• d. None of these