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Communication Systems

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

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

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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.

10
4.9
5
995

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Communication Systems
A telephone channel requires a bandwidth of about

10 kHz
3 kHz
50 kHz
1 kHz

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Communication Systems
When the length of antenna is a whole wavelength

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

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Communication Systems
PAM stands for

Pulse Amplitude Modulation
Pulse Analogue Modulation
Phase Amplitude Modulation
Phase Analogue Modulation

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Communication Systems
VSB modulation is preferred in TV because

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

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