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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) If an LTI system is described by the difference equation y(n)=ay(n-1)+bx(n), 0 < a < 1, then what is the parameter ‘b’ so that the maximum value of |H(ω)| is unity?
[A] a
[B] 1-a
[C] 1+a
[D] none of the mentioned
Answer: 1-a
(2) The output of the Linear time invariant system cannot contain the frequency components that are not contained in the input signal.
[A] True
[B] False
Answer: True

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(3) An ideal filter should have unity gain in their stop band.
[A] True
[B] False
Answer: False
(4) Which filter has a magnitude frequency response as shown in the plot given below?

[A] Low pass Filter
[B] High pass Filter
[C] Band pass Filter
[D] Band stop Filter
Answer: Band stop Filter
(5) An ideal filter should have zero gain in their stop band.
[A] True
[B] False
Answer: True
(6) The ‘Envelope delay’ or ‘Group delay’ is the time delay that the signal component of frequency ω undergoes as it passes from the input to the output of the system.
[A] True
[B] False
Answer: True
(7) If the phase ϴ(ω) of the system is linear, then the group delay of the system?
[A] Increases with frequency of signal
[B] Constant
[C] Decreases with frequency of signal
[D] Independent of frequency of signal
Answer: Constant
(8) If hlp(n) denotes the impulse response of a low pass filter with frequency response Hlp(ω), then what is the frequency response of the high pass filter in terms of Hlp(ω)?
[A] Hlp(ω-π/2)
[B] Hlp(ω+π/2)
[C] Hlp(ω-π)
[D] Hlp(ω+π)
Answer: Hlp(ω-π)
(9) If the low pass filter described by the difference equation y(n)=0.9y(n-1)+0.1x(n) is converted into a high pass filter, then what is the frequency response of the high pass filter?
[A] 0.1/(1+0.9ejω)
[B] 0.1/(1+0.9e-jω)
[C] 0.1/(1-0.9ejω)
[D] None of the mentioned
Answer: 0.1/(1+0.9e-jω)
(10) A digital resonator is a special two pole band pass filter with the pair of complex conjugate poles located near the unit circle.
[A] True
[B] False
Answer: True

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