What is the time period of a periodic signal in actual terms?

Electronics and Communication Engineering (ECE) : Signals and Systems - Quiz(MCQ)

The signals which start at t=-âˆž and end at t=+âˆž

The signals which have a short period of occurrence

The signals which have a finite interval of occurrence

The signals which start at t= -âˆž and ends at a finite time period

Correct Answer : Option (A) : The signals which start at t=-âˆž and end at t=+âˆž

Explanation : The periodic signals have actually a time period between t=-∞ and at t= + ∞. These signals have an infinite time period, that is periodic signals are actually continued forever. But this is not possible in case of real time signals.

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For a Gaussian process, auto-correlation sequence also implies that

ergodic process

statistical dependence

statistical independence

All of the above

Correct Answer : statistical dependence

Consider the following statements

1. If ensemble and time averages of a random process are identical, the process is ergodic.
2. If ensemble and time average of a random process are not identical, the process is ergodic.
3. An ergodic process is stationary.
4. A stationary process is necessarily ergodic.

Which of the above statements are correct?

1 only

1 and 3 only

1 and 4 only

1, 3 and 4 only

Correct Answer : 1 and 3 only

In RLC circuits the state variables generally selected are

voltages across capacitors

currents through resistances and capacitances

currents through inductances and voltages across capacitances

currents through resistances and voltages across capacitors

Correct Answer : currents through inductances and voltages across capacitances