Digital Signal Processing Gate Questions | Digital Signal Processing MCQs

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

View Answer

Answer:Causal

2 The system described by the input-output equations y(n)=x(-n) is a causal system.

A True

B False

View Answer

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

View Answer

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

View Answer

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}

View Answer

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 r_xy(l)=x(l)*x(-l)

B r_xy(l)=x(l)*x(l)

C r_xy(l)=x(l)+x(-l)

D None of the mentioned

View Answer

Answer:r_xy(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 a²r_xx(0)+b²r_yy(0)+2abr_xy(0)

B a²r_xx(0)+b²r_yy(0)-2abr_xy(0)

C a²r_xx(0)+b²r_yy(0)+2abr_xy(1)

D a²r_xx(0)+b²r_yy(0)-2abr_xy(1)

View Answer

Answer:a²r_xx(0)+b²r_yy(0)+2abr_xy(1)

8 Which of the following relation is true?

A r_yx(l)=h(l)*r_yy(l)

B r_xy(l)=h(l)*r_xx(l)

C r_yx(l)=h(l)*r_xx(l)

D none of the mentioned

View Answer

Answer:r_yx(l)=h(l)*r_xx(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 r_xx(l)*r_hh(l)

B r_hh(l)*r_xx(l)

C r_xy(l)*r_hh(l)

D r_yx(l)*r_hh(l)

View Answer

Answer:r_hh(l)*r_xx(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

View Answer

Answer:Sampling

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