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