ECE · all questions

Satellite Communication
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Q161

Transponders are:

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Q162

For global communication the minimum number of satellites needed is

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Q163

Due to which of the following reasons the low orbit satellite are not used for communication

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Q164

The component in the satellite that takes an uplink signal and converts into a downlink signal is called

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Q165

In satellite links the uplink and downlink frequencies are made different for which of the following purpose?

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Q166

A satellite earth station antenna having a maximum gain of 60 dB at the operational frequency is fed from a power amplifier generating 10 kW. If the feed system has a loss of 2 dB earth station EIRP is

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Q167

MEO satellites are located at altitudes between (in km)

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Q168

Tropospheric microwave communication is called what propagation

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Q169

In a satellite system, circular polarization is to be obtained. The antenna used is

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Q170

A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar?

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Q171

Wide-banding technique is employed in the

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Q172

Which of the following can be used to improve range resolution in a Radar?

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Q173

If 'r' is the radius of circular orbit then the orbital period of a satellite is directly proportional to:

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Q174

What is the maximum signal propagation time for a geosynchronous satellite transmission system?

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Q175

Blind speed problem can be overcome by

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Q176

Basic transmission loss in decibels for a synchronous satellite signal for uplink frequency of 6 GHz would be

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Q177

In Satellite communication, a repeater is placed between

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Q178

Relationship between Doppler frequency shifts of two radars A and B having 0.1 foot and 0.05 foot wave-lengths, approaching the target at 1000 feet per second and 2000 feet per second rate, respectively, will be

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Q179

In CW radar, which tracking technique is used as primary means of resolving targets?

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Q180

An advantage of passive satellites is that they do not require sophisticated electronic equipment on board, although they are not necessary void of power. Some passive satellites require which one of the following for tracking and ranging purposes?

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