Andhra University 2007 B.E fluid mechanics - Question Paper
Wednesday, 01 May 2013 03:55Web
. a. What is meant by signal? Contrast the differences ranging from
energy and power signal. 3
b) discuss operations on signals 3
c) How can we represent a signal by orthogonal set of functions
in time? 3
d) discuss various kinds of signals 3
e) How many various kinds of signal transformations are there
and discuss with example. 3
2. a) describe Z-transform and its properties. 8
b) obtain the Z-Transform of x(n)=-anu(-n-1). And provide
the region of convergence. 7
3. a) describe Fourier transform and its properties 10
b) obtain the Fourier tranform of x(n)=e-at cos (wt+F) . 5
4. a) State and Prove Sampling Theorem. 8
b) What is the effect of aliasing discuss with example. 7
5. a) How do you represent a discrete time signal as sum of infinite
impulses? 8
b) describe inverse Z-transform and methods of deducing it. 7
II Year B.E./B.Tech Degree exam
SIGNALS AND SYSTEMS
Electronics & Communication Engineering
Time : 3 hours Maximum : 75 Marks
ques. one is compulsory
ans any 4 from ques. two to 8
All ques. carry equal marks
21
6. a) discuss auto-correlation and cross-correlation of signals by
taking necessary examples 6
b) discuss Basic operation that can be performed on the signals
9
7. a) discuss discrete Time Decimation and Interpolation 5
b) describe trigonometric Fourier Series and provide the formulae
for the Fourier coefficients. 10
8. Write a note on 15
a) Causality
b) Stability
c) Linearity
Earning: Approval pending. |