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
26.
Laplace transform of eat cos (at) is
none of these
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.
27.
The impulse response of discrete time system is x[n] = (4)n ∪[3 - n], the system is
Answer: Option
Explanation:
For stability
Hence it is stable and it depend upon future value for - ve n so it is non causal.
28.
The value of the 
in + ve sense is
in + ve sense isAnswer: Option
Explanation:
Apply Cauchy integral formula.
29.
The amplitude of the first odd harmonic of the square wave shown in the given figure is
Answer: Option
Explanation:
Fourier coefficient 
.
30.
The inverse Laplace transform of 
is
ist2 e-t
te-t
Answer: Option
Explanation:
.
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