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Communication Systems

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

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

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Communication Systems
Which one of the following is analog?

PWM
PCM
Differential PCM
Delta modulation

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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
5
995
4.9

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

1
16
8
15

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Communication Systems
A buffer amplifier is

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

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Communication Systems
For attenuation of high frequencies we should use

Inductance
Shunt capacitance
Resistance
Series capacitance

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