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Communication Systems

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

False
True

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Communication Systems
In Modulation, “carrier” is

Speech voltage to be transmitted
Resultant wave
Voltage with constant frequency, phase or amplitude
Voltage for which frequency, phase or amplitude is varied

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Communication Systems
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

1
0.5
0.8

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

300 ohm
1000 ohm
500 ohm
100 ohm

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Communication Systems
A buffer amplifier is

None of these
A double-tuned amplifier
A cathode follower stage
A high gain D.C. amplifier

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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.

995
5
4.9
10

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