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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) What are the Fourier series coefficients for the signal x(n)=cosπn/3?
[A] c1=c2=c3=c4=0,c1=c5=1/2
[B] c0=c1=c2=c3=c4=c5=0
[C] c0=c1=c2=c3=c4=c5=1/2
[D] none of the mentioned
Answer: c1=c2=c3=c4=0,c1=c5=1/2
(2) What is the period of the Fourier transform X(ω) of the signal x(n)?
[A] π
[B] 1
[C] Non-periodic
[D] 2π
Answer: 2π
(3) What is the value of discrete time signal x(n) at n=0 whose Fourier transform is represented as below?
[A] ωc.π
[B] -ωc/π
[C] ωc/π
[D] none of the mentioned
Answer: ωc/π
(4) The oscillatory behavior of the approximation of XN(ω) to the function X(ω) at a point of discontinuity of X(ω) is known as Gibbs phenomenon.
[A] True
[B] False
Answer: True
(5) Which of the following relation is true if the signal x(n) is real?
[A] X*(ω)=X(ω)
[B] X*(ω)=X(-ω)
[C] X*(ω)=-X(ω)
[D] None of the mentioned
Answer: X*(ω)=X(-ω)
(6) For a signal x(n) to exhibit even symmetry, it should satisfy the condition |X(-ω)|=| X(ω)|.
[A] True
[B] False
Answer: True
(7) Which of the following condition is to be satisfied for the Fourier transform of a sequence to be equal as the Z-transform of the same sequence?
[A] |z|=1
[B] |z|<1
[C] |z|>1
[D] Can never be equal
Answer: |z|=1
(8) If x(n) is a stable sequence so that X(z) converges on to a unit circle, then the complex cepstrum signal is defined as ____________
[A] X(ln X(z))
[B] ln X(z)
[C] X-1(ln X(z))
[D] None of the mentioned
Answer: X-1(ln X(z))
(9) If a power signal has its power density spectrum concentrated about zero frequency, the signal is known as ______________
[A] Low frequency signal
[B] Middle frequency signal
[C] High frequency signal
[D] None of the mentioned
Answer: Low frequency signal
(10) What are the main characteristics of Anti aliasing filter?
[A] Ensures that bandwidth of signal to be sampled is limited to frequency range
[B] To limit the additive noise spectrum and other interference, which corrupts the signal
[C] All of the mentioned
[D] None of the mentioned
Answer: All of the mentioned
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