Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
1 The lower and upper limits on the convolution sum reflect the causality and finite duration characteristics of the filter.
A True
B False

Answer:True
2 Which of the following condition should the unit sample response of a FIR filter satisfy to have a linear phase?
A h(M-1-n) n=0,1,2…M-1
B ±h(M-1-n) n=0,1,2…M-1
C -h(M-1-n) n=0,1,2…M-1
D None of the mentioned

Answer:±h(M-1-n) n=0,1,2…M-1
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3 If H(z) is the z-transform of the impulse response of an FIR filter, then which of the following relation is true?
A zM+1.H(z-1)=±H(z)
B z-(M+1).H(z-1)=±H(z)
C z(M-1).H(z-1)=±H(z)
D z-(M-1).H(z-1)=±H(z)

Answer:z-(M-1).H(z-1)=±H(z)
4 The roots of the polynomial H(z) are identical to the roots of the polynomial H(z-1).
A True
B False

Answer:True
5 The roots of the equation H(z) must occur in ________________
A Identical
B Zero
C Reciprocal pairs
D Conjugate pairs

Answer:Reciprocal pairs
6 If the unit sample response h(n) of the filter is real, complex valued roots need not occur in complex conjugate pairs.
A True
B False

Answer:False
7 What is the value of h(M-1/2) if the unit sample response is anti-symmetric?
A 0
B 1
C -1
D None of the mentioned

Answer:0
8 What is the number of filter coefficients that specify the frequency response for h(n) symmetric?
A (M-1)/2 when M is odd and M/2 when M is even
B (M-1)/2 when M is even and M/2 when M is odd
C (M+1)/2 when M is even and M/2 when M is odd
D (M+1)/2 when M is odd and M/2 when M is even

Answer:(M+1)/2 when M is odd and M/2 when M is even
9 What is the number of filter coefficients that specify the frequency response for h(n) anti-symmetric?
A (M-1)/2 when M is even and M/2 when M is odd
B (M-1)/2 when M is odd and M/2 when M is even
C (M+1)/2 when M is even and M/2 when M is odd
D (M+1)/2 when M is odd and M/2 when M is even

Answer:(M-1)/2 when M is odd and M/2 when M is even
10 Which of the following is not suitable either as low pass or a high pass filter?
A h(n) symmetric and M odd
B h(n) symmetric and M even
C h(n) anti-symmetric and M odd
D h(n) anti-symmetric and M even

Answer:h(n) anti-symmetric and M odd

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