Top 150+ Solved Communication Engineering MCQ Questions Answer
Q. How many bits are needed for standard encoding if the size of the character set is X?
a. log x
b. x+1
c. 2x
d. x2
Q. For a error free channel, conditional probability should be
a. zero
b. one
c. equal to joint probability
d. equal to individual probability
Q. Average effective information is obtained by
a. subtracting equivocation from entropy
b. adding equivocation with entropy
c. ratio of number of error bits by total number of bits
d. none of the mentioned
Q. Turbo codes are
a. forward error correction codes
b. backward error correction codes
c. error detection codes
d. none of the mentioned
Q. Components used for generation of turbo codes are
a. inter leavers
b. punching pattern
c. inter leavers & punching pattern
d. none of the mentioned
Q. Which modulation scheme is preferred for direct sequence spread spectrum process?
a. bpsk
b. qpsk
c. bpsk & qpsk
d. none of the mentioned
Q. The minimum spacing between consecutive hop positions gives the
a. minimum number of chips necessary
b. maximum number of chips necessary
c. chip rate
d. none of the mentioned
Q. Which system allows larger processing gain?
a. direct sequence
b. frequency hopping
c. direct sequence & frequency hopping
d. none of the mentioned
Q. In which technique is phase coherence hard to maintain?
a. direct sequence
b. frequency hopping
c. direct sequence & frequency hopping
d. none of the mentioned
Q. Which type of demodulator is used in the frequency hopping technique?
a. coherent
b. non coherent
c. coherent & non coherent
d. none of the mentioned
Q. US digital cellular system based on CDMA was standardized as
a. is-54
b. is-136
c. is-95
d. is-76