Q.1.
Sampling rate conversion by the rational factor I/D is accomplished by what connection of interpolator and decimator?
- a) Parallel
- b) Cascade
- c) Convolution
- d) None of the mentioned
Q.2.
Which of the following has to be performed in sampling rate conversion by rational factor?
- a) Interpolation
- b) Decimation
- c) Either interpolation or decimation
- d) None of the mentioned
Q.3.
Which of the following operation is performed by the blocks given the figure below?
- a) Sampling rate conversion by a factor I
- b) Sampling rate conversion by a factor D
- c) Sampling rate conversion by a factor D/I
- d) Sampling rate conversion by a factor I/D
Q.4.
The Nth root of unity WN is given as _____________
- a) ej2πN
- b) e-j2πN
- c) e-j2π/N
- d) ej2π/N
Q.5.
Which of the following is true regarding the number of computations requires to compute an N-point DFT?
- a) N2 complex multiplications and N(N-1) complex additions
- b) N2 complex additions and N(N-1) complex multiplications
- c) N2 complex multiplications and N(N+1) complex additions
- d) N2 complex additions and N(N+1) complex multiplications
Q.6.
What is the DFT of the four point sequence x(n)={0,1,2,3}?
- a) {6,-2+2j-2,-2-2j}
- b) {6,-2-2j,2,-2+2j}
- c) {6,-2+2j,-2,-2-2j}
- d) {6,-2-2j,-2,-2+2j}
Q.7.
If X(k) is the N point DFT of a sequence whose Fourier series coefficients is given by ck, then which of the following is true?
- a) X(k)=Nck
- b) X(k)=ck/N
- c) X(k)=N/ck
- d) None of the mentioned
Q.8.
What is the DFT of the four point sequence x(n)={0,1,2,3}?
- a) {6,-2+2j-2,-2-2j}
- b) {6,-2-2j,2,-2+2j}
- c) {6,-2-2j,-2,-2+2j}
- d) {6,-2+2j,-2,-2-2j}
Q.9.
If W4100=Wxthen what is the value of x?
- a) 2
- b) 4
- c) 8
- d) 16