Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
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?

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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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