31. A component used to connect a balanced line to an unbalanced line is known as a
32. Which one of the following is correct? In satellite communication links, generally
33. Identify the disadvantage of satellite communication from the following.
34. Consider the following statements relating to communication satellite systems:
1. The geosynchronous orbits of the satellites are in the earth's meridional plane.
2. It is not necessary to incorporate a very low noise amplifier in the satellite as the noise temperature of the satellite antenna will be high.
3. The total delay on one round trip is about one quarter of a second which is near the limit of satisfactory two - way telephone communication.
Select correct answer out of these statements
1. The geosynchronous orbits of the satellites are in the earth's meridional plane.
2. It is not necessary to incorporate a very low noise amplifier in the satellite as the noise temperature of the satellite antenna will be high.
3. The total delay on one round trip is about one quarter of a second which is near the limit of satisfactory two - way telephone communication.
Select correct answer out of these statements
35. Which one of the following statements is not correct?
36. For communication from satellite to the earth station, microwave frequencies are used because:
37. Which of the following statement is not true about delay line cancellers?
38. A receiving antenna with a gain of 40 dB looks at a sky with a noise temperature of 15 K. The loss between the antenna and LNA input due to the feed horn is 0.4 dB, and the LNA has a noise temperature of 40 K. The G/T value is
39. Match List-I with List-II and select the correct answer:
List-I (Microwave band)
List-II (Frequency used in satellite communication)
a. C-band
1. 12 GHz to 14 GHz
b. Ku-band
2. 24 GHz to 26 GHz
c. Ka-band
3. 20 GHz to 30 GHz
4. 4 GHz to 6 GHz
| List-I (Microwave band) | List-II (Frequency used in satellite communication) |
| a. C-band | 1. 12 GHz to 14 GHz |
| b. Ku-band | 2. 24 GHz to 26 GHz |
| c. Ka-band | 3. 20 GHz to 30 GHz |
| 4. 4 GHz to 6 GHz |
40. The most probable band width of a transponder in a satellite communication system is:
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