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Tuesday, July 30, 2019

Remote Sensing Objective and MCQs


1. Which of the following is the first active satellite?
  • A. Echo I
  • B. Telstar I
  • C. Early Bird
  • D. Sputnik I
2. Which of the following is the first commercial satellite?
  • A. Early Bird
  • B. Telstar
  • C. Explorer
  • D. Courier
3. What is the first passive satellite transponder?
  • A. Sun
  • B. Early Bird
  • C. Score
  • D. Moon
4. The first satellite to receive and transmit simultaneously
  • A. Intelsat I
  • B. Agila I
  • C. Syncorn I
  • D. Telstar I
5. A helical antenna is used for satellite tracking because of
  • A. circular polarization
  • B. maneuverability
  • C. beam width
  • D. gain
6. Repeaters inside communications satellites are known as
  • A. Transceivers
  • B. Transponders
  • C. Transducers
  • D. TWT
7. Considered as the unsolved problem in satellite system
  • A. Coverage
  • B. Cost
  • C. Access
  • D. Privacy
8. ___________ is a satellite that rotates around the earth in a low-altitude elliptical or circular pattern.
  • A. Geosynchronous satellite
  • B. Nonsynchronous satellite
  • C. Prograde satellite
  • D. Retrograde satellite
9.______ Is the geographical representation of a satellite antenna radiation pattern
  • A. Footprint
  • B. Spot
  • C. Earth
  • D. Region
10. The smallest beam of a satellite antenna radiation pattern
  • A. Zone beam
  • B. Hemispheric beam
  • C. Spot beam
  • D. Global beam
11. A satellite beam that covers almost 42.4% of the earth’s surface.
  • A. Zone beam
  • B. Hemispheric beam
  • C. Spot beam
  • D. Global beam
12. What is the frequency range of C-band?
  • A. 8.5 to 12.5 GHz
  • B. 3.4 to 6.425 GHz
  • C. 12.95 to 14.95 GHz
  • D. 27.5 to 31 GHz
13. A satellite signal transmitted from a satellite transponder to earth’s station.
  • A. Uplink
  • B. Downlink
  • C. Terrestrial
  • D. Earthbound
14. Collects very weak signals from a broadcast satellite
  • A. Helical antenna
  • B. Satellite dish
  • C. LNA
  • D. TWT
15. What is a device that detects both vertically and horizontally polarized signals simultaneously?
  • A. Orthomode transducer
  • B. Crystal detector
  • C. Optoisolator
  • D. Isomode detector
16. _________ detects the satellite signal relayed from the feed and converts it to an electric current, amplifies and lowers its frequency.
  • A. Horn antenna
  • B. LNA
  • C. Satellite receiver
  • D. Satellite dish
17. Is a loss of power of a satellite downlink signal due to earth’s atmosphere.
  • A. Atmospheric loss
  • B. Path loss
  • C. Radiation loss
  • D. RFI
18. What height must a satellite be placed above the surface of the earth in order for its rotation to be equal to earth’s rotation?
  • A. 26,426.4 miles
  • B. 27,426.4 miles
  • C. 23,426.4 miles
  • D. 22,426.4 miles
19. Point on the satellite obits closest to the earth.
  • A. Apogee
  • B. Perigee
  • C. Prograde
  • D. Zenith


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