Q141
Open questionRADAR is an acronym for:
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ECE · all questionsSatellite Communication
Satellite Communication
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Q142
Open questionA method of communication in which communication takes place in both the directions, but only in one direction at a time?
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Q143
Open questionWhich of the following statements is NOT true:
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Q144
Open questionThe INSAT operates in
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Q145
Open questionTropospheric scatter communication is use for which frequency band?
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Q146
Open questionThe type of radar that is used to eliminate clutter in navigational applications is
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Q147
Open questionA radar system uses magnetron as high power RF source. Its transmitter emits 300 kW RF power at 10% duty factor. If the efficiency of radar transmitter during pulse is 60% and the power required during pulse off period is 1 kW. The average power dissipation in radar is-
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Q148
Open questionMatch List-I with List-II and select the correct answer as per the options:
| List-I | List-II |
| a. To ensure all bursts arrive the satellite in their correct time slots | 1. Loop back |
| b. Initial portion of a traffic burst that carries information similar to that carried in the reference burst | 2. Network synchronization |
| c. In refers to the fact that an earth station receives its own transmission, from which it can determine range | 3. Burst code word |
| d. It is used to establish burst timing in TDMA | 4. Preamble |
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Q149
Open questionThe basic rate of SONET is
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Q150
Open questionRandom satellite moves in
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Q151
Open questionIf the PRF is 1200 and the pulse width is 1.5 µs, the duty cycle will be
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Q152
Open questionConsider the following statements regarding communication by geostationary satellites:
1. A back and forth telephone transmission involves nearly half a second.
2. Since the ground station antenna points towards a fixed direction, large corrections are necessary to compensate for orbital variation and atmospheric diffraction.
3. Since the satellite antenna is limited in size, the earth are illuminated by the beam is also small.
4. As there is no Doppler shift, no correction for frequency is necessary.
Select the correct answer out of these statements.
1. A back and forth telephone transmission involves nearly half a second.
2. Since the ground station antenna points towards a fixed direction, large corrections are necessary to compensate for orbital variation and atmospheric diffraction.
3. Since the satellite antenna is limited in size, the earth are illuminated by the beam is also small.
4. As there is no Doppler shift, no correction for frequency is necessary.
Select the correct answer out of these statements.
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Q153
Open questionOne of the following is tracking radar
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Q154
Open questionA biostatic radar system shown in figure has following parameters; f = 5 GHz, Gdt = 34 dB, Gdr = 22 dB. To obtain a return power of 8pW the minimum necessary radiated power should be
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Q155
Open questionA satellite transmits signals at a frequency of 6 GHz to a user 40000 km away. The free space path loss incurred by the signal is nearly:
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Q156
Open questionA fixed radar station transmits 100 kW at 3 GHz. The smallest ocean-going ship has a radar cross-section of 200 m2. The radar antenna gain is 16 dB. If detection requires a minimum of 1 nW/m2 at the radar antenna, the effective range of the radar is nearly
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Q157
Open questionA vertical wire of 1 m length carries a current of 1 A at 10 MHz. The total radiating power is nearly
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Q158
Open questionWhat are the celestial bodies revolving around the planets called as?
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Q159
Open questionA geostationary satellite located at about 35000 km from earth can cover
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Q160
Open questionA low earth orbit satellite can provide large signal strength at an earth station because
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