# Elementary Signals – 1 MCQ’s

This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Elementary Signals – 1″.

1. In the equation x (t) = be^{at} if a < 0, then it is called ______

a) Growing exponential

b) Decaying exponential

c) Complex exponential

d) Both Growing and Decaying exponential

2. In the below figure if R value is increased then which of the following is true?

a) Slower the rate of decay of v (t)

b) Greater the rate of decay of v (t)

c) Decay rate is independent of R

d) Decay rate depends only on the capacitor value

3. The general form of real exponential signal is________

a) X (t) = be^{at}

b) X (t) = (b+1)e^{at}

c) X (t) = b (at)

d) X (t) = be ^{(a+1)t}

4. The time period of continuous-time sinusoidal signal is given by _____

a) T = 2π / w

b) T = 2π / 3w

c) T = π / w

d) T = π / 2w

5. X [n] = 2 cos (2n) is periodic or not?

a) Periodic with period 2n

b) Periodic with period 2π

c) Periodic with period 2

d) Non periodic

6. Find the smallest angular frequency for which the discrete time signal with fundamental period N=8 would be periodic?

a) ^{π}⁄_{4}

b) ^{π}⁄_{2}

c) ^{3π}⁄_{4}

d) ^{π}⁄_{16}

7. The natural angular frequency of the parallel LC circuit is?

a)

b)

c)

d)

8. Check whether x [n] = 7 sin (6πn) is periodic and if it is period calculate its fundamental period?

a) Periodic with fundamental period 6π

b) Periodic with fundamental period 3

c) Periodic with fundamental period 1

d) Non periodic

9. Euler’s identity e^{jθ} is expanded as _____

a) cos θ + j sin θ

b) cos θ – j sin θ

c) cos θ + j sin 2θ

d) cos 2θ+j sinθ

10. Exponentially damped sinusoidal signal is ______

a) Periodic

b) Non periodic

c) Insufficient information

d) Maybe periodic

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