20 3-10.   A satellite orbiting with an angle of inclination of approximately 90 degrees describes which of the following types of orbit? 1.   Polar 2.   Equatorial 3.   Synchronous 4.   Asynchronous 3-11.   In order to cover most of the earth except the polar regions, what is the minimum number of satellites that mast be orbited? 1. 5 2. 6 3. 3 4. 4 3-12.   There were many limitations that caused problems on the first communications satellites.  Of the following problems, which one was considered the most severe? 1.   The excessive size 2.   The excessive weight 3.   The too low orbit altitude 4.   The lack of a suitable power source 3-13.   Which of the following power sources is/are considered a practical choice for satellites? 1.   Solar cells only 2.   Storage batteries only 3.   A combination of solar cells and storage batteries 4.   Sunlight and leclanche cells 3-14.   What development in satellite communications improved back-up power during eclipses? 1.   The installation of a battery back-up 2.   The installation of a nuclear power source 3.   The continuous exposure of solar cells to the sun 4.   The increase in solar cells mounted on the surface of the satellite 3-15.   Why is satellite orientation in space so important? 1.   Because it is a necessity for back-up power 2.   To meet the requirements of spin stabilization 3.   To ensure that sunlight converging on the solar cells is converted to electrical power 4.   Because it is essential for maximum solar cell exposure to the sun and satellite antenna visibility to earth terminals 3-16.   Why are communications satellite earth terminals generally located in areas remote from the actual users? 1.   To minimize cost 2.   To minimize jamming 3.   To minimize rf interference 4.   To allow for future expansion 3-17.   Which of the following characteristics is a requirement for a satellite earth terminal antenna? 1.   It must be omnidirectional 2.   It must be of the Franklin collinear type 3.   It must have low gain and be highly directional 4.   It must be capable of transmitting and receiving signals simultaneously 3-18.   One earth terminal antenna uses a cluster of four 10-foot parabolic antennas.  This array is effectively a total of how many feet in diameter? 1. 18 2. 20 3. 32 4. 40