Top 150+ Solved Digital Communication MCQ Questions Answer
Q. In Random Variable we have
a. sample space
b. sample points
c. sample space & sample points
d. none of above
Q. In Random Process we have
a. sample function
b. ensemble of sample function
c. sample space & sample points
d. sample function & ensemble of sample function
Q. The detection method where carrier’s phase is given importance is called as
a. coherent detection
b. non coherent detection
c. coherent detection & non coherent detection
d. none of the mentioned
Q. The real part of a sinusoid carrier wave is called as
a. inphase
b. quadrature
c. inphase & quadrature
d. none of the mentioned
Q. The FSK signal which has a gentle shift from one frequency level to another is called as
a. differential psk
b. continuous psk
c. differential & continuous psk
d. none of the mentioned
Q. In differential PSK the date is
a. encoded differentially
b. decoded differentially
c. encoded & decoded differentially
d. none of the mentioned
Q. Envelope detector consists of
a. rectifier and high pass filter
b. rectifier and low pass filter
c. amplifier and low pass filter
d. amplifier and high pass filter
Q. M-ary signaling produces error performance with orthogonal signaling and error performance with multiple phase signalling.
a. degraded, improved
b. improved, degraded
c. improved, improved
d. degraded, degraded
Q. Which is more vulnerable to noise?
a. 2-ary system
b. 4-ary system
c. binary system
d. none of the mentioned
Q. The error performance of MPSK as M or k increases.
a. increases
b. decreases
c. stays constant
d. none of the mentioned
Q. In MPSK adding new signals make it vulnerable to noise and in MFSK make it vulnerable.
a. does, does not
b. does not, does
c. does, does
d. does not, does not
Q. In orthogonal signalling with symbols containing more number of bits we need power.
a. more
b. less
c. double
d. none of the mentioned