Digital Communication solved MCQs

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In uniform quantization process In uniform quantization process the step size remains same step size varies according to the values of the input signal the quantizer has linear characteristics both a and c are correct discuss The answer is: D. both a and c are correct
The process of converting the analog sample into discrete form is called The process of converting the analog sample into discrete form is called modulation multiplexing quantization sampling discuss The answer is: C. quantization
The characteristics of compressor in μ-law companding are The characteristics of compressor in μ-law companding are continuous in nature logarithmic in nature linear in nature discrete in nature discuss The answer is: A. continuous in nature
The modulation techniques used to convert analog signal into digitalsignal are The modulation techniques used to convert analog signal into digitalsignal are pulse code modulation delta modulation adaptive delta modulation all of the above discuss The answer is: D. all of the above
The sequence of operations in which PCM is done is The sequence of operations in which PCM is done is sampling, quantizing, encoding quantizing, encoding, sampling quantizing, sampling, encoding none of the above discuss The answer is: A. sampling, quantizing, encoding
In PCM, the parameter varied in accordance with the amplitude of themodulating signal is In PCM, the parameter varied in accordance with the amplitude of themodulating signal is amplitude frequency phase none of the above discuss The answer is: D. none of the above
One of the disadvantages of PCM is One of the disadvantages of PCM isa it requires large bandwidth very high noise cannot be decoded easily discuss The answer is: A. it requires large bandwidth
The expression for bandwidth BW of a PCM system, where v is thenumber of bits per sample and fm is the modulating frequency, is given by The expression for bandwidth BW of a PCM system, where v is thenumber of bits per sample and fm is the modulating frequency, is given by bw ≥ vfm bw ≤ vfm bw ≥ 2 vfm bw ≥ 1/2 vfm discuss The answer is: A. bw ≥ vfm
The error probability of a PCM is The error probability of a PCM is calculated using noise and inter symbol interference gaussian noise + error component due to inter symbol interference calculated using power spectral density all of the above discuss The answer is: D. all of the above
In Delta modulation, In Delta modulation, one bit per sample is transmitted all the coded bits used for sampling are transmitted the step size is fixed both a and c are correct discuss The answer is: D. both a and c are correct
In digital transmission, the modulation technique that requiresminimum bandwidth is In digital transmission, the modulation technique that requiresminimum bandwidth is delta modulation pcm dpcm pam discuss The answer is: A. delta modulation
n Delta Modulation, the bit rate is n Delta Modulation, the bit rate is n times the sampling frequency n times the modulating frequency n times the nyquist criteria none of the above discuss The answer is: A. n times the sampling frequency
In Differential Pulse Code Modulation techniques, the decoding isperformed by In Differential Pulse Code Modulation techniques, the decoding isperformed by accumulator sampler pll quantizer discuss The answer is: A. accumulator
DPCM suffers from DPCM suffers from slope over load distortion quantization noise both a & b none of the above discuss The answer is: C. both a & b
The noise that affects PCM The noise that affects PCM transmission noise quantizing noise transit noise both a and b are correct discuss The answer is: D. both a and b are correct
The factors that cause quantizing error in delta modulation are The factors that cause quantizing error in delta modulation are slope overload distortion granular noise white noise both a and b are correct discuss The answer is: D. both a and b are correct
Granular noise occurs when Granular noise occurs when step size is too small step size is too large there is interference from the adjacent channel bandwidth is too large discuss The answer is: B. step size is too large
The crest factor of a waveform is given as – The crest factor of a waveform is given as – 2peak value/ rms value rms value / peak value peak value/ rms value peak value/ 2rms value discuss The answer is: C. peak value/ rms value
The digital modulation technique in which the step size is variedaccording to the variation in the slope of the input is called The digital modulation technique in which the step size is variedaccording to the variation in the slope of the input is called delta modulation pcm adaptive delta modulation pam discuss The answer is: C. adaptive delta modulation
The digital modulation scheme in which the step size is not fixed is The digital modulation scheme in which the step size is not fixed is delta modulation adaptive delta modulation dpcm pcm discuss The answer is: B. adaptive delta modulation

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