Top 150+ Solved Digital Communication MCQ Questions Answer
Q. The polarities in NRZ format use
a. complete pulse duration
b. half duration
c. both positive as well as negative value
d. each pulse is used for twice the duration
Q. The format in which the positive half interval pulse is followed by anegative half interval pulse for transmission of ‘1’ is
a. polar nrz format
b. bipolar nrz format
c. manchester format
d. none of the above
Q. The maximum synchronizing capability in coding techniques ispresent in
a. manchester format
b. polar nrz
c. polar rz
d. polar quaternary nrz
Q. The advantage of using Manchester format of coding is
a. power saving
b. polarity sense at the receiver
c. noise immunity
d. none of the above
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. In DPSK technique, the technique used to encode bits is
a. ami
b. differential code
c. uni polar rz format
d. manchester format
Q. Overhead bits are
a. framing and synchronizing bits
b. data due to noise
c. encoded bits
d. none of the above
Q. ISI may be removed by using
a. differential coding
b. manchester coding
c. polar nrz
d. none of the above
Q. Timing jitter is
a. change in amplitude
b. change in frequency
c. deviation in location of the pulses
d. all of the above
Q. Probability density function defines
a. amplitudes of random noise
b. density of signal
c. probability of error
d. all of the above
Q. Impulse noise is caused due to
a. switching transients
b. lightening strikes
c. power line load switching
d. all of the above
Q. In coherent detection of signals,
a. local carrier is generated
b. carrier of frequency and phase as same as transmitted carrier is generated
c. the carrier is in synchronization with modulated carrier
d. all of the above
Q. Synchronization of signals is done using
a. pilot clock
b. extracting timing information from the received signal
c. transmitter and receiver connected to master timing source
d. all of the above
Q. Orthogonality of two codes means
a. the integrated product of two different code words is zero
b. the integrated product of two different code words is one
c. the integrated product of two same code words is zero
d. none of the above
Q. In Alternate Mark Inversion (AMI) is
a. 0 is encoded as positive pulse and 1 is encoded as negative pulse
b. 0 is encoded as no pulse and 1 is encoded as negative pulse
c. 0 is encoded as negative pulse and 1 is encoded as positive pulse
d. 0 is encoded as no pulse and 1 is encoded as positive or negative pulse