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Communication Systems

Communication Systems
Which one of the following is analog?

Delta modulation
Differential PCM
PWM
PCM

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

False
True

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Communication Systems
A telephone channel requires a bandwidth of about

50 kHz
1 kHz
3 kHz
10 kHz

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Communication Systems
Which of the following is used to generate PDM?

Free running multi-vibrator
JK flip-flop
Schmitt trigger
Monostable multi-vibrator

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

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

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Communication Systems
In Modulation, “carrier” is

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

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