MCQOPTIONS
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MCQOPTIONS
This section includes 149 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The average noise temperature of Earth, as viewed from space, is __________ °K. |
| A. | 254 |
| B. | 303 |
| C. | 100 |
| D. | 500 |
| Answer» B. 303 | |
| 2. |
The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of |
| A. | 17.34/4.5 |
| B. | 17.34 x 4.5 |
| C. | (17.34/4.5)² |
| D. | (17.34/4.5)⁴ |
| Answer» D. (17.34/4.5)⁴ | |
| 3. |
The angle subtended by earth at geostationary communication satellite is |
| A. | 17.34° |
| B. | 51.4° |
| C. | 120° |
| D. | 60° |
| Answer» B. 51.4° | |
| 4. |
As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is |
| A. | 14.85 |
| B. | 220 |
| C. | 78 |
| D. | 3.85 |
| Answer» C. 78 | |
| 5. |
Power received from Sun per m² surface area of a geosynchronous satellite in nearly __________ watt. |
| A. | 100 |
| B. | 500 |
| C. | 2000 |
| D. | 1000 |
| Answer» E. | |
| 6. |
Noise temperature of Sun is more than __________ °K. |
| A. | 1000 |
| B. | 5000 |
| C. | 100000 |
| D. | 500 |
| Answer» D. 500 | |
| 7. |
The present total cost per watt of power generation in geosynchronous orbit is nearly Rs. |
| A. | 20 |
| B. | 50 |
| C. | 100 |
| D. | 5 |
| Answer» B. 50 | |
| 8. |
A transponder is a satellite equipment which |
| A. | receives a signal from Earth station and amplifies |
| B. | changes the frequency of the received signal |
| C. | retransmits the received signal |
| D. | does all of the above-mentioned functions |
| Answer» E. | |
| 9. |
The noise temperature of sky is about __________ °K. |
| A. | 100 |
| B. | 273 |
| C. | 0 |
| D. | 30 |
| Answer» E. | |
| 10. |
Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface. |
| A. | 30.3 |
| B. | 42.4 |
| C. | 50 |
| D. | 25 |
| Answer» E. | |
| 11. |
When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K. |
| A. | 273 |
| B. | 243 |
| C. | 170 |
| D. | 123 |
| Answer» E. | |
| 12. |
In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be |
| A. | 1010 kHz |
| B. | 1455 kHz |
| C. | 1910 kHz |
| D. | 545 kHz |
| Answer» D. 545 kHz | |
| 13. |
The first Philippine Agila I will have how many transponders. |
| A. | 36 |
| B. | 48 |
| C. | 24 |
| D. | 12 |
| Answer» B. 48 | |
| 14. |
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 |
| Answer» E. | |
| 15. |
What is the approximate path loss from satellite-to-earth station? |
| A. | 100 dB |
| B. | 150 dB |
| C. | 175 dB |
| D. | 200 dB |
| Answer» E. | |
| 16. |
What is the first passive satellite transponder? |
| A. | Sun |
| B. | Early Bird |
| C. | Score |
| D. | Moon |
| Answer» C. Score | |
| 17. |
Which of the following is the first active satellite? |
| A. | Echo I |
| B. | Telstar I |
| C. | Early Bird |
| D. | Sputnik I |
| Answer» E. | |
| 18. |
The first Philippine Mabuhay satellite has how many channels? |
| A. | 30 |
| B. | 24 |
| C. | 48 |
| D. | 50 |
| Answer» B. 24 | |
| 19. |
What is the delay time for satellite transmission from earth transmitter to earth receiver? |
| A. | 0.5 s |
| B. | 1.0 s |
| C. | 5 ms |
| D. | 0.25 ms |
| Answer» B. 1.0 s | |
| 20. |
___________ 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 |
| Answer» C. Prograde satellite | |
| 21. |
Which of the following is the first commercial satellite? |
| A. | Early Bird |
| B. | Telstar |
| C. | Explorer |
| D. | Courier |
| Answer» C. Explorer | |
| 22. |
In a typical mobile satellite array antenna if three elements are activated, how many elements are deactivated? |
| A. | 3 |
| B. | 11 |
| C. | 5 |
| D. | 9 |
| Answer» C. 5 | |
| 23. |
_________ detects the satellite signal relayed from the feed and converts it to an electric current, amplifies and lower its frequency. |
| A. | Horn antenna |
| B. | LNA |
| C. | Satellite receiver |
| D. | Satellite dish |
| Answer» C. Satellite receiver | |
| 24. |
Point on the satellite obits closest to the earth. |
| A. | Apogee |
| B. | Perigee |
| C. | Prograde |
| D. | Zenith |
| Answer» C. Prograde | |
| 25. |
A method of multiple accessing where a given RF channel bandwidth is divided inot smaller frequency band. |
| A. | CDMA |
| B. | ANIK-D |
| C. | TDMA |
| D. | FDMA |
| Answer» E. | |
| 26. |
The frequency of Ku band for satellite communications. |
| A. | 6/4 GHz |
| B. | 14/11 GHz |
| C. | 12/14 GHz |
| D. | 4/8 GHz |
| Answer» C. 12/14 GHz | |
| 27. |
A satellite cross-link means |
| A. | Earth-to-satellite link |
| B. | Satellite-to-earth link |
| C. | Satellite-to-satellite link |
| D. | None of these |
| Answer» D. None of these | |
| 28. |
The first satellite to receive and transmit simultaneously |
| A. | Intelsat I |
| B. | Agila I |
| C. | Syncorn I |
| D. | Telstar I |
| Answer» E. | |
| 29. |
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 |
| Answer» C. 12.95 to 14.95 GHz | |
| 30. |
What is a device that detects both vertically and horizontally polarized signals simultaneously? |
| A. | Orthomode transducer |
| B. | Crystal detector |
| C. | Optoisolator |
| D. | Isomode detector |
| Answer» B. Crystal detector | |
| 31. |
The smallest beam of a satellite antenna radiation pattern |
| A. | Zone beam |
| B. | Hemispheric beam |
| C. | Spot beam |
| D. | Global beam |
| Answer» D. Global beam | |
| 32. |
Is the geographical representation of a satellite antenna radiation pattern |
| A. | Footprint |
| B. | Spot |
| C. | Earth |
| D. | Region |
| Answer» B. Spot | |
| 33. |
INTELSAT stands for |
| A. | Intel Satellite |
| B. | International Telephone Satellite |
| C. | International Telecommunications Satellite |
| D. | International Satellite |
| Answer» D. International Satellite | |
| 34. |
What circuit is responsible in activating and deactivating adjacent antenna elements in a mobile satellite array? |
| A. | Radial divider |
| B. | Divider/combiner |
| C. | Radial combiner |
| D. | Radial multiplexer |
| Answer» B. Divider/combiner | |
| 35. |
The switching from one element to the other element in a typical mobile satellite array. |
| A. | Series |
| B. | Radial |
| C. | Matrix |
| D. | Shunt |
| Answer» E. | |
| 36. |
How may satellite orbital slots are requested by the Philippine Government from ITU? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 37. |
What is the local oscillator (mixer) frequency of the satellite with an uplink frequency in GHz band? |
| A. | 3500 MHz |
| B. | 4500 MHz |
| C. | 2225 MHz |
| D. | 2555 MHz |
| Answer» D. 2555 MHz | |
| 38. |
The bandwidth of C-band satellite frequency band in U.S. |
| A. | 500 GHz |
| B. | 1000 GHz |
| C. | 1000 MHz |
| D. | 500 MHz |
| Answer» E. | |
| 39. |
Repeaters inside communications satellites are known as |
| A. | Trancievers |
| B. | Transponders |
| C. | Transducers |
| D. | TWT |
| Answer» C. Transducers | |
| 40. |
A satellite batter has more power but lighter. |
| A. | Lithium |
| B. | Leclanche |
| C. | Hydrogen |
| D. | Magnesium |
| Answer» B. Leclanche | |
| 41. |
What kind of battery panels are used in some advance satellites |
| A. | Germanium based panels |
| B. | Silicon based panel |
| C. | Galium Phosphate solar panel array |
| D. | Galium Arsenide solar panel array |
| Answer» E. | |
| 42. |
The radiation patterns of earth coverage antennas have a beamwidth of approximately |
| A. | 21˚ |
| B. | 5˚ |
| C. | 17˚ |
| D. | 35˚ |
| Answer» D. 35˚ | |
| 43. |
The most common device used as an LNA is |
| A. | Zener diode |
| B. | Tunnel diode |
| C. | IMPATT |
| D. | Shockley diode |
| Answer» C. IMPATT | |
| 44. |
The location of AsiaSat I. |
| A. | 105.5˚ East |
| B. | 151.5˚ East |
| C. | 115.5˚ East |
| D. | 170.5˚ East |
| Answer» B. 151.5˚ East | |
| 45. |
What kind of battery used by older satellites? |
| A. | Lithium |
| B. | Leclanche |
| C. | Hydrogen |
| D. | Magnesium |
| Answer» D. Magnesium | |
| 46. |
The earth area covered by a satellite radio beam. |
| A. | Beamwidth |
| B. | Bandwidth |
| C. | Footprint |
| D. | Zone |
| Answer» D. Zone | |
| 47. |
Satellite engine uses |
| A. | Jet propulsion |
| B. | Ion propulsion system |
| C. | Liquid fuel |
| D. | Solar jet |
| Answer» C. Liquid fuel | |
| 48. |
VSAT was made available in |
| A. | 1979 |
| B. | 1981 |
| C. | 1983 |
| D. | 1977 |
| Answer» B. 1981 | |
| 49. |
What band does VSAT first operate? |
| A. | L-band |
| B. | X-band |
| C. | C-band |
| D. | Ku-band |
| Answer» D. Ku-band | |
| 50. |
A helical antenna is used for satellite tracking because of |
| A. | Circular polarization |
| B. | Maneuverability |
| C. | Beamwidth |
| D. | Gain |
| Answer» B. Maneuverability | |