ECE · all questions

Satellite Communication
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Q101

PPI scan type radar display can

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Q102

A radar system that can determine both target range as well as target velocity is

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Q103

The orbital satellites are

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Q104

The orbital period of a satellite in a circular orbit of 500 km above the Earth's surface, taking mean radius of the Earth as 6400 km and Kepler's constant µ as 4 × 10⁵ km³/s² nearly

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Q105

An automotive radar operates at a frequency of 8 GHz. The Doppler shift due to an automobile directly approaching the radar at a speed of 160 km per hour is

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Q106

The output stage of a transponder on board a satellite has a maximum power output of 10 watts. However, it is not operated at the maximum power output in order to

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Q107

The maximum unambiguous range of pulsed radar depends upon

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Q108

Linear velocity of a satellite in a circular orbit is

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Q109

The mean sun does at a uniform speed but otherwise requires the same time as the real sun to complete one orbit of the earth, this time being

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Q110

In a pulsed radar, the peak radar transmitter power is increased by a factor of 81 keeping all other radar parameters unchanged. The maximum range capability of the radar increases by a factor of

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Q111

The transmission path loss for a geostationary satellite signal for uplink frequency of 6 GHz is

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Q112

In radar systems, the term 'rat-race' is used in connection with

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Q113

The propagation time from one earth station to another earth station via Geo-stationary satellite is approximately:

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Q114

What is the reason for using frequencies of the order of a few GHz in satellite communication?

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Q115

The code division multiple access technique is not used in satellite communication because of

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Q116

Which factor determines the range resolution of a radar?

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Q117

Antenna elevation angle at the ground station for satellite communication is always kept above 5° to

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Q118

The height of Geostationary satellite (above earth) used for satellite communication is nearly

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Q119

In satellite communication, highly directional antennas are used to

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Q120

Long distance communication system via satellite uses frequency range.

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