# Electronics and Communication Engineering - Signals and Systems

## Why Electronics and Communication Engineering Signals and Systems?

In this section you can learn and practice Electronics and Communication Engineering Questions based on "Signals and Systems" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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## Where can I get Electronics and Communication Engineering Signals and Systems Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type Electronics and Communication Engineering Signals and Systems questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

## How to solve Electronics and Communication Engineering Signals and Systems problems?

You can easily solve all kind of Electronics and Communication Engineering questions based on Signals and Systems by practicing the objective type exercises given below, also get shortcut methods to solve Electronics and Communication Engineering Signals and Systems problems.

### Exercise :: Signals and Systems - Section 1

1.

What about the stability of system in

 A. system is stable B. unstable C. stable at 0.4 D. cant say

Explanation:

ROC include the unit circle hence it is stable.

2.

Which one most appropriate dynamic system?

 A. y(n) + y(n - 1) + y(n + 1) B. y(n) + y(n - 1) C. y(n) = x(n) D. y(n) + y(n - 1) + y(n + 3) = 0

Explanation:

Because present output of y(n) depend upon past y(n - 1) and future y(n + 1).

3.

An energy signal has G(f) = 10. Its energy density spectrum is

 A. 10 B. 100 C. 50 D. 20

Explanation:

Energy density spectrum = |G(f)|2 = |10|2 = 100.

4.

Consider Pole zero diagram as shown, If two Poles are moved in opposite direction towards ω = p/2 and -p/2, the filter will be

 A. change to high pass filter B. change to Band Pass filter C. remains same D. change to LPF

Explanation:

But still we will get the same response, zero are at same position.

5.

In an ac circuit the fundamental component of current wave lags the corresponding voltage wave by 20°. The third harmonic component of current wave lags the corresponding voltage by an angle.

 A. less than 20° B. more than 20° C. equal to 20° D. equal to or more than 20°