Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
1 What are the Fourier series coefficients for the signal x(n)=cosπn/3?
A c1=c2=c3=c4=0,c1=c5=1/2
B c0=c1=c2=c3=c4=c5=0
C c0=c1=c2=c3=c4=c5=1/2
D none of the mentioned

Answer:c1=c2=c3=c4=0,c1=c5=1/2
2 What is the period of the Fourier transform X(ω) of the signal x(n)?
A π
B 1
C Non-periodic
D 2π

Answer:2π
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3 What is the value of discrete time signal x(n) at n=0 whose Fourier transform is represented as below?
A ωc.π
B -ωc/π
C ωc/π
D none of the mentioned

Answer:ωc/π
4 The oscillatory behavior of the approximation of XN(ω) to the function X(ω) at a point of discontinuity of X(ω) is known as Gibbs phenomenon.
A True
B False

Answer:True
5 Which of the following relation is true if the signal x(n) is real?
A X*(ω)=X(ω)
B X*(ω)=X(-ω)
C X*(ω)=-X(ω)
D None of the mentioned

Answer:X*(ω)=X(-ω)
6 For a signal x(n) to exhibit even symmetry, it should satisfy the condition |X(-ω)|=| X(ω)|.
A True
B False

Answer:True
7 Which of the following condition is to be satisfied for the Fourier transform of a sequence to be equal as the Z-transform of the same sequence?
A |z|=1
B |z|<1
C |z|>1
D Can never be equal

Answer:|z|=1
8 If x(n) is a stable sequence so that X(z) converges on to a unit circle, then the complex cepstrum signal is defined as ____________
A X(ln X(z))
B ln X(z)
C X-1(ln X(z))
D None of the mentioned

Answer:X-1(ln X(z))
9 If a power signal has its power density spectrum concentrated about zero frequency, the signal is known as ______________
A Low frequency signal
B Middle frequency signal
C High frequency signal
D None of the mentioned

Answer:Low frequency signal
10 What are the main characteristics of Anti aliasing filter?
A Ensures that bandwidth of signal to be sampled is limited to frequency range
B To limit the additive noise spectrum and other interference, which corrupts the signal
C All of the mentioned
D None of the mentioned

Answer:All of the mentioned

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