Digital Communication System MCQs
Practice free Digital Communication System multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 252 questions — no login required.
Question 172easy
Noise voltage varies ma resistor as
Question 173easy
The rms noise voltage of an amplifier due to aninput resistor is 20 microvolts in a bandwidth of 2 HMz. If the operating bandwidth is doubled, the noise voltage will become (rounded to nearest whole number).
Question 174easy
The mean square volue of the shot noise current
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Question 175easy
Quadrature multiplexing is
Question 176easy
For a given data rate, the bandwidth required with m-ary transmission is smaller than that for binary transmission by
Question 177easy
Four voice signals, each limited to 4 kHz and sampled at Nyquist rate, are converted into binary PCM signal using 256 quantisation levels. The bit transmission rate for the time-division multiplexed signal will be
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Question 178easy
In ionosphere, the incidence angle is 60. The maximum unstable frequency will be
Question 179easy
In a PCM, the amplitude levels are
Question 180easy
In a DM (delta modulation) system, the granular (idling) noise occurs when the