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Electronics and Communication Engineering - Signals and Systems

Exercise : Signals and Systems - Section 5
11.
If δ(t) denotes a unit impulse, Laplace transform of is
1
s2
s
s-2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The function (sin x)/x
has a period 2p, decays with increasing x and has zeros at np, n = ± 1, ± 2
has a period p
has a period p/2
has a period 2p, decays with increasing x, is an even function and has zeros at np, n = ± 1, ± 2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Which of the following represents a stable system?
  1. Impulse response decreases exponentially.
  2. Area within the impulse response in finite.
  3. Eigen values of the system are positive and real.
  4. Roots of the characteristic equation of the system are real and positive.
Select the answer using the following codes:
1 and 4
1 and 3
2, 3 and 4
1, 2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The Laplace transform of cos ωt is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Auto correlation for t = 0 is equal to
average power S of waveform
square of average power S of waveform
half of average power S of waveform
square root of average power S of waveform
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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