Digital Signals and Systems (December – 2017) [IDOL - Revised Course | Question Paper]

Internet Technologies (December - 2017) [IDOL - Revised Course | Question Paper]

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Time: 3 Hours
Total Marks: 100

NOTE:
(1) All Question are Compulsory.
(2) Make Suitable Assumptions Wherever Necessary And State The Assumptions Made.
(3) Answer To The Same Question Must Be Written Together.
(4) Number To The Right Indicates Marks.
(5) Draw Neat Labeled Diagrams Wherever Necessary.
(6) Use of Non-Programmable Calculator is allowed.

Q.1 Attempt any two of the following: (10 Marks)
(A) What are the advantages of Digital Signal Processing (DSP) over Analog Signal Processing (ASP)?
(B) What is region of convergence?
(C) With reference to z-Transform, state and the initial and final value theorem
(D) Define the terms:
     (i) Linearity
     (ii) Causality

Q.2 Attempt any three of the following: (15 Marks)
(A) Define & give the graphical representation of Unit step and Unit impulse
(B) Discuss the classification of systems.
(C) Draw and explain the block diagram of an analog – to – digital converter.
(D) What is meant by sampling? State sampling theorem.
(E) What is meant by quantisation and encoding?
(F) Write a note on Dirichlet’s conditions.

Q.3 Attempt any three of the following: (15 Marks)
(A) Find the Laplace transform of Cosine function
(B) Find Laplace transform of the periodic sawtooth waveform with period of one cycle T
(C) State any five properties of Laplace transform.
(D) Define the network transfer function & explain how to obtain output impulse & step response using transfer function.
(E) State and explain Laplace Transform and its inverse transform
(F) Obtain Laplace transform for step and Impulse Responses of Series R-L Circuit

Q.4 Attempt any three of the following: (15 Marks)
(A) Define z-Transform. Explain the use of z-Transform
(B) Compare the properties of tw-sided z-transform with those of one-sided z-Transform
(C) What is the condition for z-Transform to exist?
(D) Obtain the Z-Transform of x(n)=n2u(n).
(E) How is z-Transform obtained from Laplace transform?
(F) State and explain the properties of z-Transform.

Q.5 Attempt any three of the following: (15 Marks)
(A) Simple problems to check the Linearity and Causality of the signals.
(B) Explain briefly the Paley-Wiener criterion
(C) Explain stability in Linear Time Invariant system. What is the condiction for a system to be BIBO stable?
(D) What is convolution? What are the properties of convolution?
(E) What is frequency response? What are the properties of frequency response?
(F) Check whether the system F[x(n)]= n[x(n)]2 is Linear and Time-Variant.

Q.6 Attempt any three of the following: (15 Marks)
(A) Explain any 5 properties of DFT
(B) State and explain the properties of Discrete Fourier Series.
(C) Define Discrete Fourier Transform (DFT) for a sequence x(n)
(D) What are the methods used to perform Fast Convolution. Explain any one method giving all the steps involved to perform Fast Convolution.
(E) Compute Linear and Circular Periodic Convolutions of the sequence x1(n)= {1,1,2,2} and x2(n)= {1,2,3,4} using DFT.
(F) State the relationship between DFT and z-Transform

Q.7 Attempt any three of the following: (15 Marks)
(A) Explain the effects of windowing. Define Rectangular and Hamming window functions.
(B) Describe the Inverse Chebyshev filters.
(C) Obtain the system functions of normalized Butterworth filters for order N = 1 & 2.
(D) State the advantages of Digital filters.
(E) Describe elliptical filters in detail.
(F) Explain the procedure for designing an FIR filter using Kaiser window.