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Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

Free download in PDF Digital Signal Processing Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) If the frequency response of an FIR system is given as H(z)=1-z-1-6z-2, then the system is ___________
[A] Minimum phase
[B] Maximum phase
[C] Mixed phase
[D] None of the mentioned
Answer: Maximum phase
(2)  If the frequency response of an FIR system is given as H(z)=1-5/2z-1-3/2z-2, then the system is ___________
[A] Minimum phase
[B] Maximum phase
[C] Mixed phase
[D] None of the mentioned
Answer: Mixed phase
(3) A causal system produces the output sequence y(n)={1,0.7} when excited by the input sequence x(n)={1,-0.7,0.1}, then what is the impulse response of the system function?
[A] [3(0.5)n+4(0.2)n]u(n)
[B] [4(0.5)n-3(0.2)n]u(n)
[C] [4(0.5)n+3(0.2)n]u(n)
[D] None of the mentioned
Answer: [4(0.5)n-3(0.2)n]u(n)
(4) A finite duration sequence of length L is given as x(n)=1 for 0≤n≤L-1 = 0 otherwise, then what is the N point DFT of this sequence for N=L?
[A] X(k) = L for k=0, 1, 2….L-1
[B] 
X(k) = L for k=0
=0 for k=1,2....L-1
[C] 
X(k) = L for k=0
=1 for k=1,2....L-1
[D] None of the mentioned
Answer: 
X(k) = L for k=0
=0 for k=1,2....L-1
(5) The Nth rot of unity WN is given as ______________
[A] ej2πN
[B]  e-j2πN
[C]  e-j2π/N
[D] ej2π/N
Answer:  e-j2π/N
(6) 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
Answer: N2 complex multiplications and N(N-1) complex additions
(7) 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}
Answer: {6,-2+2j,-2,-2-2j}
(8) 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
Answer: X(k)=Nck
(9) 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}
Answer: {6,-2+2j,-2,-2-2j}
(10) If W4100=Wx200, then what is the value of x?
[A] 2
[B] 4
[C] 8
[D] 16
Answer: 8
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