Electronics and Communication Engineering - Signals and Systems

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
- 12
12
20
- 20
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
5A
12.5 A
0.05 A
1250 A
Answer: Option
Explanation: