Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
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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