Question

2)
A signal not limited in time, as defined below is a power signal.
g(t) ={
e t te (-infty,0)
e (-t) te(0, infty).


a. True
b. False
​

Answer 1

The correct answer to this question is option a. True.

Explanation:

• A power signal is a signal whose total power is finite and non-zero. The energy of the power signal is always infinite.  

• The power signal is not limited in time.  

• It always subsists from beginning to end and it never terminates.  

• For instance, the sine wave in infinite length is a power signal. Because the energy of a power signal is infinite, it has no significance to us.  

• Hence, we use power (energy per unit time) for the power signal, as the power of the power signal is set, 0 < P < ∞.