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Communication Systems

Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

0.5 kW
20 kW
50 kW
8 kW

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Communication Systems
A modem is classified as low speed if data rate handled is

Upto 100 bps
Upto 400 bps
Upto 250 bps
Upto 600 bps

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Communication Systems
Which one of the following is analog?

Differential PCM
Delta modulation
PCM
PWM

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Communication Systems
When the length of antenna is a whole wavelength

The radiation at right angles is maximum
The radiation at right angles is zero
The radiation is maximum in all directions
The radiation is zero in all directions

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

Better linearity
Improved efficiency
High power output per transistor
The lower modulating power requirement

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Communication Systems
If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

5
995
4.9
10

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