Download PTU B.Tech 2021 Jan EE 7th Sem 71938 Digital Signal Processing Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 7th Sem 71938 Digital Signal Processing Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (EE) (2011 Onwards Elective-II) (Sem.?7)
DIGITAL SIGNAL PROCESSING
Subject Code : BTEE-804C
M.Code : 71938
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
What is an Energy and Power signal?
2.
Define recursive and non-recursive system.
3.
Determine the fundamental period of the signal.
30n
x (n) cos
105
4.
Check for following system is stable or unstable.
1
y (n) x
2n
5.
State the convolution property of Fourier Transform.
6.
What is ROC in Z-Transform?
7.
State the time reversal property of Z-transform.
8.
Why the result of circular and linear convolution is not same?
9.
What are the various methods to design IIR filters?
10. Write the steps involved in FIR filter design.
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SECTION-B
11. Explain the classification of discrete systems.
12. Find the Z-transform and sketch the ROC :
x (n) = an cos 0 nu (n)
13. Obtain inverse Z-transform of :
1
1
1
z
2
X (Z )
| z | 1 / 2
1
2
1
z
4
14. Compute the Fourier Transform of x(n) = 2nu(n).
15. Determine the length-4 sequence from its DFT :
X(K) = [2, l ? j, 0, l + j]
SECTION-C
16. The system function of analog filter is as given
s 0.1
H (S )
a
2
(s 0.1) 9
17. Design a FIR low pass filter using Kaiser Window having following specifications :
Pass-band cut-off frequency = 150 Hz
Stopband cut-off frequency = 250 Hz
Passband ripple = 0.1 dB
Stopband attenuation = 40 dB
Sampling frequency = 1000 Hz
18. a) State and prove convolution property of DFT.
b) Determine the length-4 sequence from its DFT
X(K) = [2, 1 ? j, 0, 1 + j]
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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