Electronics and Communication Engineering - Signals and Systems
Exercise : Signals and Systems - Section 1
- 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.
A function having frequency f is to be sampled. The sampling time T should be
Answer: Option
Explanation:
Sampling frequency must be more than 2f. Therefore 
.
27.
The final value theorem 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.
28.
If 
Answer: Option
Explanation:
det.|A| = 3(8 - 12) = - 12.
29.
Inverse Fourier transform of sgn (ω) is
1
U(t)
Answer: Option
Explanation:
By duality Property.
30.
If I (s) 
, the final value of i(t) is
, the final value of i(t) isAnswer: Option
Explanation:
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