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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 the output of the system of the system at any ‘n’ depends only the present or the past values of the inputs then the system is said to be __________
[A] Linear
[B] Non-Linear
[C] Causal
[D] Non-causal
Answer: Causal
(2) The system described by the input-output equations y(n)=x(-n) is a causal system.
[A] True
[B] False
Answer: False

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(3) If a system do not have a bounded output for bounded input, then the system is said to be __________
[A] Causal
[B] Non-causal
[C] Stable
[D] Non-stable
Answer: Non-stable
(4) Which of the following parameters are required to calculate the correlation between the signals x(n) and y(n)?
[A] Time delay
[B] Attenuation factor
[C] Noise signal
[D] All of the mentioned
Answer: All of the mentioned
(5) What is the cross correlation sequence of the following sequences?

x(n)={….0,0,2,-1,3,7,1,2,-3,0,0….}

y(n)={….0,0,1,-1,2,-2,4,1,-2,5,0,0….}

[A] {10,9,19,36,-14,33,0,7,13,-18,16,7,5,-3}
[B] {10,-9,19,36,-14,33,0,7,13,-18,16,-7,5,-3}
[C] {10,9,19,36,14,33,0,-7,13,-18,16,-7,5,-3}
[D] {10,-9,19,36,-14,33,0,-7,13,18,16,7,5,-3}
Answer: {10,-9,19,36,-14,33,0,7,13,-18,16,-7,5,-3}
(6) Which of the following is the auto correlation of x(n)?
[A] rxy(l)=x(l)*x(-l)
[B] rxy(l)=x(l)*x(l)
[C] rxy(l)=x(l)+x(-l)
[D] None of the mentioned
Answer: rxy(l)=x(l)*x(-l)
(7) What is the energy sequence of the signal ax(n)+by(n-l) in terms of cross correlation and auto correlation sequences?
[A] a2rxx(0)+b2ryy(0)+2abrxy(0)
[B] a2rxx(0)+b2ryy(0)-2abrxy(0)

[C] a2rxx(0)+b2ryy(0)+2abrxy(1)
[D] a2rxx(0)+b2ryy(0)-2abrxy(1)
Answer: a2rxx(0)+b2ryy(0)+2abrxy(1)
(8) Which of the following relation is true?
[A] ryx(l)=h(l)*ryy(l)
[B] rxy(l)=h(l)*rxx(l)
[C] ryx(l)=h(l)*rxx(l)
[D] none of the mentioned
Answer: ryx(l)=h(l)*rxx(l)
(9) If x(n) is the input signal of a system with impulse response h(n) and y(n) is the output signal, then the auto correlation of the signal y(n) is?
[A] rxx(l)*rhh(l)
[B] rhh(l)*rxx(l)
[C] rxy(l)*rhh(l)
[D] ryx(l)*rhh(l)
Answer: rhh(l)*rxx(l)
(10) Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?
[A] Sampling
[B] Differentiating
[C] Integrating
[D] None of the mentioned
Answer: Sampling

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