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Communication Systems

Communication Systems
Which of the following is a digital modulation technique?

All
PCM
PSK
DM

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Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 100.1
200 and 10.01
200 and 200
200 and 1.01

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

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

500 ohm
1000 ohm
300 ohm
100 ohm

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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Half duplex arrangement
Duplex arrangement
Either A or B
Neither A nor B

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

20 kW
0.5 kW
50 kW
8 kW

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