Top 150+ Solved Digital Communication MCQ Questions Answer
Q. Zero forced equalizers are used for
a. reducing isi to zero
b. sampling
c. quantization
d. none of the abov
Q. The preferred orthogonalization process for its numerical stability is
a. gram- schmidt process
b. house holder transformation
c. optimization
d. all of the above
Q. For two vectors to be orthonormal, the vectors are also said to beorthogonal. The reverse of the same
a. is true
b. is not true
c. is not predictable
d. none of the above
Q. Orthonormal set is a set of all vectors that are
a. mutually orthonormal and are of unit length
b. mutually orthonormal and of null length
c. both a & b
d. none of the above
Q. In On-Off keying, the carrier signal is transmitted with signal value‘1’ and ‘0’ indicates
a. no carrier
b. half the carrier amplitude
c. amplitude of modulating signal
d. none of the above
Q. ASK modulated signal has the bandwidth
a. same as the bandwidth of baseband signal
b. half the bandwidth of baseband signal
c. double the bandwidth of baseband signal
d. none of the above
Q. Coherent detection of binary ASK signal requires
a. phase synchronization
b. timing synchronization
c. amplitude synchronization
d. both a and b
Q. The probability of error of DPSK is ______________ than that ofBPSK.
a. higher
b. lower
c. same
d. not predictable
Q. In Binary FSK, mark and space respectively represent
a. 1 and 0
b. 0 and 1
c. 11 and 00
d. 00 and 11
Q. The frequency shifts in the BFSK usually lies in the range
a. 50 to 1000 hz
b. 100 to 2000 hz
c. 200 to 500 hz
d. 500 to 10 hz
Q. The spectrum of BFSK may be viewed as the sum of
a. two ask spectra
b. two psk spectra
c. two fsk spectra
d. none of the above
Q. QPSK is a modulation scheme where each symbol consists of
a. 4 bits
b. 2 bits
c. 1 bits
d. m number of bits, depending upon the requireme