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Communication Systems

Communication Systems
Skip distance depends on time of day and angle of incidence.

True
False

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Communication Systems
For telegraphy the most commonly used modulation system is

Single tone modulation
PCM
Two tone modulation
FSK

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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
4.9
995
10

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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 1.01
200 and 100.1
200 and 10.01
200 and 200

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Communication Systems
As per Shannon-Hartley theorem, a noise less Gaussian channel has

Zero capacity
Infinite capacity
Small capacity
None of these

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Communication Systems
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

80.9
70.2
113
102.3

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