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

1000 ohm
300 ohm
500 ohm
100 ohm

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Communication Systems
Commercial Frequency deviation of FM is

80 kHz
65 kHz
75 kHz
70 kHz

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Communication Systems
When the length of antenna is a whole wavelength

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

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Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

3
2
1
-3

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Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and even harmonics
Fundamental and subharmonic sine waves
A fundamental sine wave and harmonics
A fundamental sine wave and odd harmonics

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