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Communication Systems

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

1000 ohm
500 ohm
100 ohm
300 ohm

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Communication Systems
In EM waves, polarization

Is caused by reflection
Is always vertical in an isotropic medium
Results from longitudinal nature of waves
Is due to transverse nature of waves

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Communication Systems
VSB modulation is preferred in TV because

It avoids phase distortion at low frequencies
It reduces the bandwidth requirement to half
None of these
It results in better reception

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

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

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Communication Systems
In a TV receiver antenna the length of reflector rod

May be equal, more or less than that of dipole
Is the same as that of dipole
Is more than that of dipole
Is less than that of dipole

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Communication Systems
In practical commercial FM system, channel bandwidth is

108 MHz
150 kHz
88 MHz
100 kHz

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MORE MCQ ON Communication Systems

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