Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
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
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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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