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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 yk(n) is the convolution of the finite duration input sequence x(n) of length N, then what is the impulse response of the filter?
[A] WN-kn
[B] WN-kn u(n)
[C] WNkn u(n)
[D] None of the mentioned
Answer: WN-kn u(n)
(2) What is the expression to compute yk(n) recursively?
[A] yk(n)=WN-kyk(n+1)+x(n)
[B] yk(n)=WN-kyk(n-1)+x(n)
[C] yk(n)=WNkyk(n+1)+x(n)
[D] None of the mentioned
Answer: yk(n)=WN-kyk(n-1)+x(n)

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(3) If the contour is a circle of radius r and the zk are N equally spaced points, then what is the value of zk?
[A] re-j2πkn/N
[B] rejπkn/N
[C] rej2πkn
[D] rej2πkn/N
Answer: rej2πkn/N
(4) How many multiplications are required to calculate X(k) by chirp-z transform if x(n) is of length N?
[A] N-1
[B] N
[C] N+1
[D] None of the mentioned
Answer: N+1
(5) If the contour on which the z-transform is evaluated is as shown below, then which of the given condition is true?

[A] R0>1
[B] R0<1
[C] R0=1
[D] None of the mentioned
Answer: R0>1
(6) How many complex multiplications are need to be performed to calculate chirp z-transform?(M=N+L-1)
[A] log2M
[B] Mlog2M
[C] (M-1)log2M
[D] Mlog2(M-1)
Answer: Mlog2M
(7) The effect of round off errors due to the multiplications performed in the DFT with fixed point arithmetic is known as Quantization error.
[A] True
[B] False
Answer: True
(8) What is the model that has been adopt for characterizing round of errors in multiplication?
[A] Multiplicative white noise model
[B] Subtractive white noise model
[C] Additive white noise model
[D] None of the mentioned
Answer: Additive white noise model
(9) How many quantization errors are present in one complex valued multiplication?
[A] One
[B] Two
[C] Three
[D] Four
Answer: Four
(10) What is the total number of quantization errors in the computation of single point DFT of a sequence of length N?
[A] 2N
[B] 4N
[C] 8N
[D] 12N
Answer: 4N

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