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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 signal to be analyzed is an analog signal, we would pass it through an anti-aliasing filter with B as the bandwidth of the filtered signal and then the signal is sampled at a rate __________
[A] Fs ≤ 2B
[B] Fs ≤ B
[C] Fs ≥ 2B
[D] Fs = 2B
Answer: Fs ≥ 2B
(2) What is the highest frequency that is contained in the sampled signal?
[A] 2Fs
[B] Fs/2
[C] Fs
[D] None of the mentioned
Answer: Fs/2
(3) The finite observation interval for the signal places a limit on the frequency resolution.
[A] True
[B] False
Answer: True
(4) If {x(n)} is the signal to be analyzed, limiting the duration of the sequence to L samples, in the interval 0≤ n≤ L-1, is equivalent to multiplying {x(n)} by?
[A] Kaiser window
[B] Hamming window
[C] Hamming window
[D] Hamming window
Answer: Hamming window
(5) If x(n)=cosω0n and W(ω) is the Fourier transform of the rectangular signal w(n), then what is the Fourier transform of the signal x(n).w(n)?
[A] 1/2[W(ω-ω0)- W(ω+ω0)]
[B] 1/2[W(ω-ω0)+ W(ω+ω0)]
[C] [W(ω-ω0)+ W(ω+ω0)]
[D] [W(ω-ω0)- W(ω+ω0)]
Answer: 1/2[W(ω-ω0)+ W(ω+ω0)]
(6) The characteristic of windowing the signal called “Leakage” is the power that is leaked out into the entire frequency range.
[A] True
[B] False
Answer: True
(7) Which of the following is the advantage of Hanning window over rectangular window?
[A] More side lobes
[B] Less side lobes
[C] More width of main lobe
[D] None of the mentioned
Answer: Less side lobe
(8) Which of the following is the disadvantage of Hanning window over rectangular window?
[A] More side lobes
[B] Less side lobes
[C] More width of main lobe
[D] None of the mentioned
Answer: More width of main lobe
(9) The condition with less number of samples L should be avoided.
[A] True
[B] False
Answer: True
(10) Which of the following is true regarding the number of computations required 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
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