Electronics and Communication Engineering - Signals and Systems
Exercise : Signals and Systems - Section 2
- Signals and Systems - Section 1
- Signals and Systems - Section 2
- Signals and Systems - Section 3
- Signals and Systems - Section 4
- Signals and Systems - Section 5
- Signals and Systems - Section 6
- Signals and Systems - Section 7
- Signals and Systems - Section 8
- Signals and Systems - Section 9
- Signals and Systems - Section 10
41.
Let 
be the Fourier transform of y(n), then y(ej0) is
be the Fourier transform of y(n), then y(ej0) isAnswer: Option
Explanation:
.
42.
The Laplace transform of a vlotage across a capacitor is Vc (s) = 
. If capacitor is 0.5 F, The current through capacitor at t = 0+ is
. If capacitor is 0.5 F, The current through capacitor at t = 0+ isAnswer: Option
Explanation:
.
43.
The value of Integral 
(t2 + 2) δ(t - 3)dt is equal to
(t2 + 2) δ(t - 3)dt is equal toAnswer: Option
Explanation:
Because t = 3 is lies out of integral limit.
44.
The z transform of sequence x[n] = {2, 4, 3, 2}
Answer: Option
Explanation:
n(z) = 2z+2 + 4z+1 + 3 + 2z-1 or 2z-1 + 3 + 4z+1 + 2z+2
.
45.
For the function u(t - a) = 0 for t < a and u(t - a) = 1 fort ≥ a, the Laplace transform is
Answer: Option
Explanation:
£f(t) = 
£-1F(s) = f(t)
£[a f1(t) + bf2(t)] = aF1(s) + bF2(s)
where 
£[f(t - T)] = e-sT F(s)
£[e-at f(t)] = F(s + a)
Initial value theorem 
Final value theroem 
Convolution Integral 
where t is dummy variable for t.
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