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
21.
If
then for this to be true x(t) is

Answer: Option
Explanation:
If
.
22.
For the discrete time system of the given figure


Answer: Option
Explanation:
uk + 0.5 yk - 1 - 0.25 yk - 2 = yk.
23.
The analog signal m(t) is given below m(t) = 4 cos 100 pt + 8 sin 200 pt + cos 300 pt, the Nyquist sampling rate will be
Answer: Option
Explanation:
m (t) = 4 cos 100 pt + 8 sin 200 pt + cos 300 pt
Nyquist sampling freq fs ≤ 2fm where fm is highest frequency component in given signal and highest fm in 3rd part
2pfmt = 300 pt
fm = 150 Hz
fs = 2 x 150 p 300 Hz
.
24.
The ROC of sequence in the Z.T. of sequence x[n] = an ∪ [n] is
Answer: Option
Explanation:
The simplest method to find the ROC. Put denominator to greater than zero.
25.
In Laplace transform, multiplication by e-at in time domain becomes
Answer: Option
Explanation:
£e-at f(t) = F(s + a).
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