ர 02000EC202052005 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fourth semester B.Tech examinations (S), September 2020

Course Code: EC202
Course Name: SIGNALS & SYSTEMS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks

1 a) Determine if the following signals are energy signals, power signals or neither. (6)

Calculate the Energy and Total average power for all signals.

൫05 (-0.5) (ಗಿ
(ii) x(t) = Asin(Q,t +0)

(iii) x[n] = 27]
b) 48 (6)

) x(t)*A(t), where x(t) = € (¢) and A(t) = e“u(-t), a > 0

n

(ii) Given x[n]=1,n2=0 hn] = ॥ 1 |
= )(,7 >0 4 2

8 lim p[7], 717070 19] = x[7]* AL]
ind ^+

u[n|- 1 ‡ ) || ۱

Here * represents convolution.

c) Check whether the given signals are periodic. If so, compute the period. (3)

५ (ग) + अण ग्‌
ഗ്യ]

(i)
(i) x[n]= sin 2/7
2 a) Determine whether the following systems are (9)

a) causal, b) stable, c) linear, d) time invariant e) memoryless

(1) y[n]=ax[n]+b
‏رن‎ 7 (८) = 1, (t)cos(Q,t)

3८
1) = f xtc)
(iii) ~=

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