Q181
Open questionSame Amplitude, 90° phase difference indicate which polarization?
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ECE · all questionsSatellite Communication
Satellite Communication
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Q182
Open questionA radar transmitter has a PRF of 1500 PPS and a pulse width of 1 micro second. Its duty cycle is
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Q183
Open questionA chip radar is another name for a
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Q184
Open questionConsider the following:
1. Synch
2. Video
3. Sweep
4. Sound
Which of the voltages are found in the output of a normal monochrome receiver video detector?
1. Synch
2. Video
3. Sweep
4. Sound
Which of the voltages are found in the output of a normal monochrome receiver video detector?
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Q185
Open questionThe sensitivity of a radar receiver is ultimately set by
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Q186
Open questionThe satellite communication link between two point is established with uplink carrier-to-noise ratio of 20 dB and downlink carrier to noise ratio of 14 dB. The overall C/N is close to:
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Q187
Open questionIn a typical mobile satellite array antenna, if three elements are activated, how many elements are deactivated?
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Q188
Open questionThe biggest disadvantage of CW Doppler radar is that
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Q189
Open questionIf the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of
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Q190
Open questionHelical antenna is used for satellite tracking because of its
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Q191
Open questionSatellite used for international communication are known as
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Q192
Open questionWhich one of the following statements is correct?
Digital modulation techniques are used in satellite communication systems since
Digital modulation techniques are used in satellite communication systems since
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Q193
Open questionMatch List-I with List-II and select the correct answer as per the options:
| List-I | List-II |
| a. The point farthest from earth | 1. Retrograde orbit |
| b. Direct orbit | 2. Mean anomaly |
| c. The inclination of this orbit always lies between 90º and 180º | 3. Apogee |
| d. Average value of the angular position of the satellite with reference to the perigee | 4. Prograde orbit |
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Q194
Open questionMatch List-I with List-II and select the correct answer as per the options:
| List-I | List-II |
| a. The path followed by a satellite around the primary will be an ellipse | 1. True Anomaly |
| b. The angle from the perigee to the satellite position, measured at the earth’s centre | 2. Keplerian element set |
| c. Earth-Orbiting artificial satellites are defined by six orbital elements | 3. Perigee |
| d. The point of closest approach to earth | 4. Kepler's first law |
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Q195
Open questionAn earth station at sea level communicates at an elevation angle of 35° with GEO satellite. The vertical height of the stratiform rain is 3 km. The physical path length L through the rain will be nearly
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Q196
Open questionThe beam of a radar should be
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Q197
Open questionThe point at which satellite intersects the equatorial plane while going from north to south is known as-
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Q198
Open questionA satellite that simply reflects back the signals from one region of the earth to the other region is known as
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Q199
Open questionIn a geostationary satellite communication system, a message signal is transmitted from an earth station via an uplink to a satellite, amplified in a transponder on board the satellite and then transmitted via a downlink to another earth station. The most popular frequency band for satellite communication is
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Q200
Open questionSatellite channel can be attributed
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