Satellite Communications MCQ
201. Navstar GPS satellite grouping capable of detecting certain error conditions, then automatically transmitting a coded message indicating that it is out of service.
- A. Block I
- B. Block IIa
- C. Block II
- D. Block IIR
202. Galileo Satellites has a lifespan of ____.
- A. greater than 12 years
- B. greater than 15 years
- C. greater than 20 years
- D. greater than 25 years
203. The height of a satellite in a synchronous equatorial orbit is
- A. 100 mi
- B. 6800 mi
- C. 22,300 mi
- D. 35,860 mi
204. An orbit that is 36,000 km away from the geocenter of the earth is called
- A. Geosynchronous orbit
- B. Clarke orbit
- C. Clarke belt
- D. Any of these
205. The main function of a communications satellite is as
- A. Repeater
- B. Reflector
- C. Beacon
- D. Observation platform
206. Navstar GPS grouping intended to be used only for self testing.
- A. Block I
- B. Block III
- C. Block II
- D. Block IIR
207. It is the direction of maximum gain of the earth station antenna
- A. Footprint
- B. Boresight
- C. Angle of elevation
- D. Angle of azimuth
208. A circular orbit around the equator with 24-h period is called
- A. Elliptical orbit
- B. Geostationary orbit
- C. Polar orbit
- D. Transfer orbit
209. A classification of satellite that uses the angular momentum of its spinning body to provide roll and yaw stabilization.
- A. Roll stabilizer satellite
- B. Yaw stabilizer satellite
- C. Spinner stabilizer satellite
- D. Three-axis stabilizer satellite
210. Most satellites operate in which frequency band?
- A. 30 to 300 MHz
- B. 300 MHz to 3 GHz
- C. 3 to 30 GHz
- D. Above 300 GHz
11. The method of assigning adjacent channels different electromagnetic polarization is called
- A. Frequency reuse
- B. Polarization
- C. Multi-accessing
- D. Interference
212. It implies that more than one user has an access to one or more radio channels
- A. Co-channel interference
- B. Satellite multi-accessing
- C. Frequency reuse
- D. Diversity
213. The main power sources for a satellite are
- A. Batteries
- B. Solar cells
- C. Fuel cells
- D. Thermoelectric generators
214. A type of satellite’s multiple-accessing method that allows all users continuous and equal access of the entire transponder bandwidth by assigning carrier frequencies on a temporary basis using statistical assignment process.
- A. TDMA
- B. FDMA
- C. DAMA
- D. CDMA
215. Batteries are used to power all satellite subsystems
- A. All the time
- B. Only during emergencies
- C. During eclipse periods
- D. To give the solar arrays a rest
216. The highly accurate timing clocks onboard the GPS satellite.
- A. Plutonium clocks
- B. Cesium atomic clocks
- C. Hydrogen clocks
- D. Fossil clocks
217. It is defined as the art or science of plotting, ascertaining, or directing the course of movement.
- A. Ranging
- B. Detection
- C. Navigation
- D. Driving
218. Galileo satellite system is positioned in ____.
- A. 5 circular orbits
- B. 3 circular orbits
- C. 2 circular orbits
- D. 6 circular orbits
219. The maximum height of an elliptical orbit is called the
- A. Perigee
- B. Apex
- C. Zenith
- D. Apogee
220. The most ancient and rudimentary method of navigation is ____.
- A. Wandering
- B. Celestial navigation
- C. Piloting
- D. Radio navigation
221. The jet thrusters are usually fired to
- A. Main attitude
- B. Put the satellite into transfer orbit
- C. Inject the satellite into the geosynchronous orbit
- D. Bring the satellite back to earth
222. A method of navigation where direction and distance are determined from precisely timed sightings of celestial bodies, including the stars and the moon.
- A. Electronic navigation
- B. Heavenly navigation
- C. Radio navigation
- D. Celestial navigation
223. Navstar satellite takes approximately ____ hours to orbit Earth.
- A. 20
- B. 6
- C. 12
- D. 18
224. A method of navigation where it fixes a position or direction with respect to familiar, significant landmarks such as railroad tracks, water towers, barns, mountain peaks and bodies or water.
- A. Dead reckoning
- B. Radio navigation
- C. Wandering
- D. Piloting
225. How can multiple earth stations share a satellite on the same frequencies?
- A. Frequency reuse
- B. Multiplexing
- C. Mixing
- D. They can’t
226. A navigation technique that determines position by extrapolating a series of measured velocity increments.
- A. Piloting
- B. Wandering
- C. Radio navigation
- D. Dead reckoning
227. A geostationary satellite
- A. Is motionless in space (except for its gain)
- B. Is not really stationary at all, but orbits the Earth within a 24-hr period
- C. Appears stationary over the Earth’s magnetic pole
- D. Is located at a height of 35,800 km to ensure global coverage
228. The average elevation of Navstar GPS satellite is ____ statue miles above the Earth.
- A. 6724
- B. 7689
- C. 5978
- D. 9476
229. Most commercial satellite activity occurs in which band(s)
- A. L
- B. C and Ku
- C. X
- D. S and P
230. Indicate the correct statement regarding satellite communications
- A. If two earth stations do not face a common satellite, they should communicate via a double-satellite hop.
- B. Satellites are allocated so that it is impossible for two earth stations not to face the same satellite.
- C. Collocated earth stations are used for frequency diversity.
- D. Satellite earth station must have as many receive chains as there are carriers transmitted to it.
231. Satellite used for intercontinental communications are known as
- A. Comsat
- B. Domsat
- C. Marisat
- D. Intelsat
232. Identical telephone numbers in different parts of the country are distinguished by their
- A. Language digits
- B. Access digits
- C. Area codes
- D. Central office codes
233. The GPS satellites has an angle of elevation at the ascending node of ____ with respect to the equatorial plane.
- A. 30 degrees
- B. 55 degrees
- C. 50 degrees
- D. 45 degrees
234. Telephone traffic is measured
- A. With echo cancellers
- B. By the relative congestion
- C. In terms of the grade of service
- D. In erlangs
235. Indicate which of the following is not a submarine cable
- A. TAT-7
- B. INTELSAT V
- C. ATLANTIS
- D. CANTAT 2
236. The typical bandwidth of a satellite band is
- A. 36 MHz
- B. 40 MHz
- C. 70 MHz
- D. 500 MHz
237. The operational satellites of Navstar GPS are revolving around Earth in orbital planes are approximately ____ degrees apart with ____ satellites in each plane.
- A. 60, 4
- B. 30, 5
- C. 50, 5
- D. 40, 3
238. Indicate which of the following is an American domsat system
- A. INTELSAT
- B. TELSTAR
- C. COMSAT
- D. INMARSAT
239. Which of the following is not usually a part of a transponder?
- A. LNA
- B. Mixer
- C. Modulator
- D. HPA
240. Who is the oldest man in space?
- A. John Glenn
- B. Neil Armstrong
- C. Yuri Gagarin
- D. Edwin Aldrin
241. It refers to the satellite orientation with respect to the earth.
- A. Satellite’s attitude
- B. Satellite position
- C. Satellite location
- D. Satellite orbit
242. Precise positioning service has time transfer accuracy to UTC within
- A. 100 nanoseconds
- B. 300 nanoseconds
- C. 200 nanoseconds
- D. 400 nanoseconds
243. The fully deployed Galileo satellite system consists of ____ satellites.
- A. 27 operational + 3 active spares
- B. 26 operational + 4 active spares
- C. 28 operational + 2 active spares
- D. 25 operational + 5 active spares
244. Galileo satellite is ____.
- A. Medium Earth Orbit (MEO)
- B. Low Earth Orbit (LEO)
- C. Geosynchronous Earth Orbit (GEO)
- D. Highly Elliptical Orbit (HEO)
245. Galileo satellites are at circular planes at ____ altitude above Earth.
- A. 23,500 mi
- B. 36,500 km
- C. 35,800 mi
- D. 23,222 km
246. Galileo satellites are inclined at the orbital planes of ____ with reference to the equatorial plane.
- A. 64 degrees
- B. 17 degrees
- C. 56 degrees
- D. 34 degrees
247. Which of the following refers to a delayed repeater satellite?
- a. A satellite capable of receiving, amplifying, and retransmitting information to and from earth stations.
- b. A bent-pipe or a reflector which bounces a signal from one place to another.
- c. A satellite which receives transmissions from earth stations, stored them on magnetic tape, and rebroadcast them to ground stations farther along in its orbit.
- d. All of these
248. Satellite orbiting in the same direction as earth’s rotation and at an angular velocity greater than the earth is called prograde orbit; and a satellite orbiting which is in the opposite direction as Earth’s rotation or in the same direction but at an angular velocity less than that of Earth is known as
- a. Haley’s orbit
- b. Elliptical orbit
- c. Equatorial orbit
- d. Retrograde orbit
249. Are satellites that orbit in a circular pattern with an angular velocity equal to that of earth.
- a. Geostationary or geosynchronous satellite
- b. Nonsynchronous satellite
- c. Orbital satellites
- d. B or C is correct
250. What do you call of a satellite used to provide satellite services within a single country?
- a. Orbital satellite
- b. Geostationary satellite
- c. Nonsynchronous satellite
- d. Domestic satellite or domsat
Satellite Communications MCQ - Answer
201. Block II
202. greater than 12 years
203. 22,300 mi
204. Any of these
205. Repeater
206. Block I
207. Boresight
208. Geostationary orbit
209. Spinner stabilizer satellite
210. 3 to 30 GHz
211. Frequency reuse
212. Satellite multi-accessing
213. Solar cells
214. DAMA
215. During eclipse periods
216. Cesium atomic clocks
217. Navigation
218. 3 circular orbits
219. Apogee
220. Wandering
221. Main attitude
222. Celestial navigation
223. 12
224. Piloting
225. Frequency reuse
226. Dead reckoning
227. Is not really stationary at all, but orbits the Earth within a 24-hr period
228. 9476
229. C and Ku
230. Satellite earth station must have as many receive chains as there are carriers transmitted to it.
231. Intelsat
232. Area codes
233. 55 degrees
234. In erlangs
235. INTELSAT V
236. 500 MHz
237. 60, 4
238. TELSTAR
239. Modulator
240. John Glenn
241. Satellite’s attitude
242. 200 nanoseconds
243. 27 operational + 3 active spares
244. Medium Earth Orbit (MEO)
245. 23,222 km
246. 56 degrees
247. A satellite which receives transmissions from earth stations, stored them on magnetic tape, and rebroadcast them to ground stations farther along in its orbit.
248. Retrograde orbit
249. Geostationary or geosynchronous satellite
250. Domestic satellite or domsat
