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Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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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 x1(n)={1,2,3} and x2(n)={1,1,1}, then what is the convolution sequence of the given two signals?
[A] {1,2,3,1,1}
[B] {1,2,3,4,5}
[C] {1,3,5,6,2}
[D] {1,2,6,5,3}
Answer: {1,2,6,5,3}
(2) What are the values of z for which the value of X(z)=0?
[A] Poles
[B] Zeros
[C] Solutions
[D] None of the mentioned
Answer: Zeros

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(3) What are the values of z for which the value of X(z)=∞?
[A] Poles
[B] Zeros
[C] Solutions
[D] None of the mentioned
Answer: Poles
(4) If X(z) has M finite zeros and N finite poles, then which of the following condition is true?
[A] |N-M| poles at origin(if N>M)
[B] |N+M| zeros at origin(if N>M)
[C] |N+M| poles at origin(if N>M)
[D] |N-M| zeros at origin(if N>M)
Answer: |N-M| zeros at origin(if N>M)
(5) If the ROC of X(z) is r1<|z|<r2, then what is the ROC of X(a-1z)?
[A] |a|r1<|z|<|a|r2
[B] |a|r1>|z|>|a|r2
[C] |a|r1<|z|>|a|r2
[D] |a|r1>|z|<|a|r2
Answer: |a|r1<|z|<|a|r2
(6) Which of the following signals have a pole-zero plot as shown below?(Let M=8 in the figure)
[A] 
x(n)=an, 0≤n≤8
    =0, elsewhere
[B] 
x(n)=an, 0≤n≤7
    =0, elsewhere
[C] 
x(n)=a-n, 0≤n≤8
    =0, elsewhere
[D] 
x(n)=a-n, 0≤n≤7
    =0, elsewhere
Answer: 
x(n)=an, 0≤n≤7
    =0, elsewhere
(7) The z-transform X(z) of the signal x(n)=anu(n) has:
[A] One pole at z=0 and one zero at z=a
[B] One pole at z=0 and one zero at z=0
[C] One pole at z=a and one zero at z=a
[D] One pole at z=a and one zero at z=0
Answer: One pole at z=a and one zero at z=0
(8) What is the nature of the signal whose pole-zero plot is as shown?

[A] Rising signal
[B] Constant signal
[C] Decaying signal
[D] None of the mentioned
Answer: Decaying signal
(9) What are the values of z for which the value of X(z)=0?
[A] Poles
[B] Zeros
[C] Solutions
[D] None of the mentioned
Answer: Zeros
(10) What is the unit sample response of the system described by the difference equation y(n)=0.5y(n-1)+2x(n)?
[A] 0.5(2)nu(n)
[B] 2(0.5)nu(n)
[C] 0.5(2)nu(-n)
[D] 2(0.5)nu(-n)
Answer: 2(0.5)nu(n)

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