BEE FREE BEE Bachelor of Electrical Engineering Signals and Control Systems Questions and Answers 2

Question 1

What is the Laplace transform of a unit ramp function r(t) = t·u(t)?

Accepted Answer

1/s²

Answer

1/s

Answer

s

Answer

1/(s+1)

Question 2

A system with transfer function G(s) = 5/(s² + 4s + 5) has poles at which locations?

Accepted Answer

-2 ± j

Answer

-4 ± j

Answer

-1 ± 2j

Answer

-2 ± 2j

Question 3

In a Bode plot, a first-order pole contributes what slope change at its corner frequency?

Accepted Answer

-20 dB/decade

Answer

-40 dB/decade

Answer

+20 dB/decade

Answer

-10 dB/decade

Question 4

What does the Nyquist stability criterion use to determine closed-loop stability?

Accepted Answer

Number of encirclements of the -1 point

Answer

Root locus plot

Answer

Bode magnitude only

Answer

Step response overshoot

Question 5

For a continuous-time LTI system, if the impulse response h(t) is absolutely integrable, the system is considered:

Accepted Answer

BIBO stable

Answer

Causal

Answer

Marginally stable

Answer

Unstable

Question 6

The region of convergence (ROC) of a causal signal's Laplace transform is:

Accepted Answer

To the right of the rightmost pole

Answer

The entire s-plane

Answer

To the left of the leftmost pole

Answer

A vertical strip between two poles