21. Medium Earth Orbits (MEO) are: A. Less than 10,000 Km above Earth B. More th

Question

21. Medium Earth Orbits (MEO) are: A. Less than 10,000 Km above Earth B. More than 10,000 Km above Earth C. More than 10,000 Km above Earth but less than the geo-synchronous orbits D. Above the geo-synchronous orbits E. None of the above is true. 22. In the frequency division multiple access (FDMA) technique A. Transmitted signals occupy overlapping frequency bands B. Transmitted signals share time slots on a single high frequency carrier C. Transmitted signals occupy non-overlapping frequency bands D. A guard band is used to avoid inter-modulation products. E. None of the above is true. 23. In an FDMA system: A. It needs to be operated to full capacity to avoid inter-channel interference. B. It needs to be operated to less than full capacity to avoid inter-channel interference. C. Inter-channel interference is not affected by operating the system to any level of capacity D. Inter-channel interference is affected by operating the system to different levels of capacity E. None of the above is true. 24. In the time division multiple access (TDMA) technique: A. Transmitted signals occupy overlapping time slots without a guard band B. Transmitted signals occupy overlapping time slots with a guard band C. Transmited signals occupy non-overlapping time slots without a guard band D. Transmitted signals occupy non-overlapping time slots with a guard band E. None of the above is true.

Explanation / Answer

1. Medium earth orbit is above low earth orbits but below geostationary orbits (2000 km to 35,786 km.)C is the correct answer.C is the correct answer

2. Transmitting signal occupies non overlapping frequency bandsC is the correct answer

4 Non-overlapping time slots are used without a guard band

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