Top 150+ Solved Digital Communication MCQ Questions Answer
Q. In uniform quantization process
a. the step size remains same
b. step size varies according to the values of the input signal
c. the quantizer has linear characteristics
d. both a and c are correct
Q. The process of converting the analog sample into discrete form is called
a. modulation
b. multiplexing
c. quantization
d. sampling
Q. The modulation techniques used to convert analog signal into digitalsignal are
a. pulse code modulation
b. delta modulation
c. adaptive delta modulation
d. all of the above
Q. The sequence of operations in which PCM is done is
a. sampling, quantizing, encoding
b. quantizing, encoding, sampling
c. quantizing, sampling, encoding
d. none of the above
Q. In PCM, the parameter varied in accordance with the amplitude of themodulating signal is
a. amplitude
b. frequency
c. phase
d. none of the above
Q. One of the disadvantages of PCM is
a. it requires large bandwidth
b. very high noise
c. cannot be decoded easily
d. all of the above
Q. The error probability of a PCM is
a. calculated using noise and inter symbol interference
b. gaussian noise + error component due to inter symbol interference
c. calculated using power spectral density
d. all of the above
Q. In Delta modulation,
a. one bit per sample is transmitted
b. all the coded bits used for sampling are transmitted
c. the step size is fixed
d. both a and c are correct
Q. In digital transmission, the modulation technique that requiresminimum bandwidth is
a. delta modulation
b. pcm
c. dpcm
d. pam
Q. In Delta Modulation, the bit rate is
a. n times the sampling frequency
b. n times the modulating frequency
c. n times the nyquist criteria
d. none of the above
Q. In Differential Pulse Code Modulation techniques, the decoding isperformed by
a. accumulator
b. sampler
c. pll
d. quantizer
Q. DPCM suffers from
a. slope over load distortion
b. quantization noise
c. both a & b
d. none of the above
Q. The noise that affects PCM
a. transmission noise
b. quantizing noise
c. transit noise
d. both a and b are correct
Q. The factors that cause quantizing error in delta modulation are
a. slope overload distortion
b. granular noise
c. white noise
d. both a and b are correct
Q. Granular noise occurs when
a. step size is too small
b. step size is too large
c. there is interference from the adjacent channel
d. bandwidth is too large