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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) The impulse response of a LTI system is h(n)={1,1,1}. What is the response of the signal to the input x(n)={1,2,3}?
[A] {1,3,6,3,1}
[B] {1,2,3,2,1}
[C] {1,3,6,5,3}
[D] {1,1,1,0,0}
Answer: {1,3,6,5,3}
(2)  x(n)*(h1(n)*h2(n))=(x(n)*h1(n))*h2(n).
[A] True
[B] False
Answer: True
(3) An LTI system is said to be causal if and only if?
[A] Impulse response is non-zero for positive values of n
[B] Impulse response is zero for positive values of n
[C] Impulse response is non-zero for negative values of n
[D] Impulse response is zero for negative values of n
Answer: Impulse response is zero for negative values of n
(4) x(n)*δ(n-n0)=?
[A] x(n+n0)
[B] x(n-n0)
[C] x(-n-n0)
[D] x(-n+n0)
Answer: x(n-n0)
(5) Is the system with impulse response h(n)=2nu(n-1) stable.
[A] True
[B] False
Answer: False
(6) If x(n) is a discrete-time signal, then the value of x(n) at non integer value of ‘n’ is?
[A] Zero
[B] Positive
[C] Negative
[D] Not defined
Answer: Not defined
(7) The discrete time function defined as u(n)=n for n≥0;u(n)=0 for n<0 is an _____________
[A] Unit sample signal
[B] Unit step signal
[C] Unit ramp signal
[D] None of the mentioned
Answer: Unit ramp signal
(8) The phase function of a discrete time signal x(n)=an, where a=r.ejθ is?
[A] tan(nθ)
[B] nθ
[C] tan-1(nθ)
[D] none of the mentioned
Answer: nθ
(9) x(n)*δ(n-k)=?
[A] x(n)
[B] x(k)
[C] x(k)*δ(n-k)
[D] x(k)*δ(k)
Answer: x(k)*δ(n-k)
(10) A real valued signal x(n) is called as anti-symmetric if ___________
[A] x(n)=x(-n)
[B] x(n)=-x(-n)
[C] x(n)=-x(n)
[D] none of the mentioned
Answer: x(n)=-x(-n)
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