UNIT-I
SAQ’S
1. Define Energy signal.
2. Estimate when the set of vectors are orthogonal over an interval (t1,t2).
3. Write a short note on unit impulse function
4. Define Causality and stability of a signal.
5. Explain the analogy between vectors and signals
6. List conditions defined for a signal to be energy or power
7. Define Orthogonality in complex functions.
8. Discuss about unit step, ramp, and parabolic functions and Outline the relation among
the functions.
LAQ’S
1. Apply basic operations on signals. Illustrate with relevant examples
2. Illustrate the Orthogonality in Complex functions
3. Illustrate the concept of impulse function. Explain how signum function is expressed
in terms of unit step function.
4. Solve the system
d3y(t)
dt3+2d2y(t)
dt2+4dy (t)
dt +3y2(t)=x(t+1)
is
i) Static or Dynamic ii)Linear or Non-Linear
iii)Causal or Non-causal iv)Time-invariant or time variant
5. Develop the expression for mean square error when a function is approximated in set
of mutually orthogonal functions.
6. Discuss in detail about the classification of signals
7. Solve the following system y(t)=t2x(t)+x(t-4) is
a)static or dynamic b) linear or non-linear
c) causal or non-causal d) time variant or invariant
8. Relate the properties of unit impulse function.
9. Analyze the following signals sinnω0t and cosmω0t are orthogonal or not over the
interval (t0 ,t0 + 2π/ω0).
10. Define Linear and Non-Linear systems. Apply the conditions and check whether the
following systems are linear or not.
i) y(t)=ex(t) ii) y(n)=nx(n)
11. Define various elementary continuous time signals. Illustrate them graphically
UNIT-II
SAQ’S
1. Define the trigonometric Fourier series.
2. Write the conditions for the existence of Fourier transform.
3. List the Dirichlet’s conditions for existence of Fourier Series.
