Top 150+ Solved Digital Communication MCQ Questions Answer
Q. Minimum shift keying is similar to
a. continuous phase frequency shift keying
b. binary phase shift keying
c. binary frequency shift keying
d. qpsk
Q. In MSK, the difference between the higher and lower frequency is
a. same as the bit rate
b. half of the bit rate
c. twice of the bit rate
d. four time the bit rate
Q. The technique that may be used to reduce the side band power is
a. msk
b. bpsk
c. gaussian minimum shift keying
d. bfsk
Q. Analog to digital conversion includes
a. sampling
b. quantization
c. sampling & quantization
d. none of above
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 digital signal are
a. adm
b. pcm
c. dm
d. all of 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 requires minimum 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 is performed by
a. accumulator
b. sampler
c. pll
d. quantizer
Q. The crest factor of a waveform is given as –
a. 2 x peak value/ rms value
b. rms value / peak value
c. peak value/ rms value
d. peak value/ 2rms value
Q. The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called
a. delta modulation
b. pcm
c. adaptive delta modulation
d. pam
Q. Impulse sampling is also called as
a. delta sampling
b. ideal sampling
c. natural sampling
d. both a & b
Q. Alternate Mark Inversion (AMI) is also known as
a. pseudo ternary coding
b. manchester coding
c. polar nrz format
d. none of the above
Q. The process of coding multiplexer output into electrical pulses or waveforms for transmission is called
a. line coding
b. amplitude modulation
c. fsk
d. filtering