SRM University 2007 B.Tech Electronics and Communications Engineering BANK : Signals and Systems - Question Paper

48. Is the subsequent system invertible y(t)=x2(t)
49. Check whether the subsequent system is linear or causal y(t) =x(t2)
50. Determine the energy and power of the signal A ej?o n
51. When a discrete time system is BIBO stable.

Part-B


1.List the classifications of signals. discuss them.
2.List the classifications of systems. discuss them.
3.List the basic operations on signals. discuss them.
4.Sketch the subsequent signals
(i) r (t) - 2r (t-1) + r (t-2)
(ii) ? (t- ½ )
5. Sketch the subsequent signals
(i) r (t) u (2-t)
(ii) ? (t-1)/2 + ? (t-1)
6. Sketch the subsequent signals
(i) r (-0.5t+2)
(ii) u (t)-u (t-2)
7. obtain the even and odd components of the subsequent signals.
(i) x (t) = sin t + 2sin t +2 sin2t cos t
(ii) x(t) = { 1,0,-1,2,3 }
8. obtain which of the subsequent signals are energy signals or power signals
(i) x(t) = e -3t u (t)
(ii) x(n) = cos (?/4)n
9. discuss how CT signals are represented using impulses.
10. discuss how DT signals are represented using impulses.
11.Check whether the provided system is stable or dynamic,
linear or non-linear,
causal or non-casual,
time-invarient or time –varient
y(t) d2y(t)/dt2 + 3tdy(t)/dt+y(t) = x(t)
12.Check whether the provided system is stable or dynamic,
linear or non-linear,
causal or non-casual,
time-invarient or time –varient
d3y(t)/dt3+4d2y(t)/dt2 + 5dy(t)/dt+2y2(t) = x(t)

13.Check whether the provided system is stable or dynamic,
linear or non-linear,
causal or non-casual,
time-invarient or time –varient
y(n)=x(n) x(n-1)

14. Verify the linearity , causality and time invariance of the system
y(n+2) = ax(n+1) + bx(n+3)
15. What is the periodicity of the signal x(t) = sin 100 ? t + cos 150 ? t
16. provided y[n] = x[n] +1/8 x[n-1]+1/3 x[n-2]
obtain whether the system is stable or not.
17. Test whether the subsequent system of formula represent LTI system.
(i) y(t)=t[x(t)]2
(ii) y(t)= a[x(t)] two +b x(t)

Unit- II

PART – A

1. Define Fourier Series.
2. What are the Dirichlet Conditions.

Earning:   Approval pending.