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

[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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