Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
1 Which of the following filters have a frequency response as shown below?

Digital Signal Processing

A Band pass filter
B Band stop filter
C All pass filter
D Notch filter

Answer:Notch filter
2 A comb filter is a special case of notch filter in which the nulls occur periodically across the frequency band.
A True
B False

Answer:True
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3 The filter with the system function H(z)=z-k is a ____________
A Notch filter
B Band pass filter
C All pass filter
D None of the mentioned

Answer:All pass filter
4 If the system has a impulse response as h(n)=Asin(n+1)ω0u(n), then the system is known as Digital frequency synthesizer.
A True
B False

Answer:True
5 If a system is said to be invertible, then?
A One-to-one correspondence between its input and output signals
B One-to-many correspondence between its input and output signals
C Many-to-one correspondence between its input and output signals
D None of the mentioned

Answer:One-to-one correspondence between its input and output signals
6 If h(n) is the impulse response of an LTI system T and h1(n) is the impulse response of the inverse system T-1, then which of the following is true?
A [h(n)*h1(n)].x(n)=x(n)
B [h(n).h1(n)].x(n)=x(n)
C [h(n)*h1(n)]*x(n)=x(n)
D [h(n).h1(n)]*x(n)=x(n)

Answer:[h(n)*h1(n)]*x(n)=x(n)
7 What is the inverse of the system with impulse response h(n)=(1/2)nu(n)?
A δ(n)+1/2 δ(n-1)
B δ(n)-1/2 δ(n-1)
C δ(n)-1/2 δ(n+1)
D δ(n)+1/2 δ(n+1)

Answer:δ(n)-1/2 δ(n-1)
8 What is the inverse of the system with impulse response h(n)=δ(n)-1/2δ(n-1)?
A (1/2)nu(n)
B -(1/2)nu(-n-1)
C (1/2)nu(n) & -(1/2)nu(-n-1)
D None of the mentioned

Answer:(1/2)nu(n) & -(1/2)nu(-n-1)
9 What is the causal inverse of the FIR system with impulse response h(n)=δ(n)-aδ(n-1)?
A δ(n)-aδ(n-1)
B δ(n)+aδ(n-1)
C a-n
D an

Answer:an
10 If the frequency response of an FIR system is given as H(z)=6+z-1-z-2, then the system is ___________
A Minimum phase
B Maximum phase
C Mixed phase
D None of the mentioned

Answer:Minimum phase

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