BEE BEE Bachelor of Electrical Engineering Control System Principles Questions and Answers 3

Question 1

Which method graphically represents all possible closed-loop pole locations as a parameter (typically gain) varies from zero to infinity?

Accepted Answer

Root locus method

Answer

Bode plot

Answer

Nyquist plot

Answer

Nichols chart

Question 2

For a second-order underdamped system, which parameter directly determines the frequency of oscillation in the transient response?

Accepted Answer

Damped natural frequency

Answer

Undamped natural frequency

Answer

Damping ratio alone

Answer

DC gain

Question 3

What is the transfer function of a PID controller in the Laplace domain?

Accepted Answer

Kp + Ki/s + Kd·s

Answer

Kp · Ki · Kd · s

Answer

Kp / (1 + Ki·s + Kd·s²)

Answer

Kp · s / (s + Ki)

Question 4

In the Nyquist stability criterion, what must be counted to determine closed-loop stability?

Accepted Answer

Encirclements of the -1+j0 point by the Nyquist plot

Answer

Crossings of the 0 dB line on the Bode magnitude plot

Answer

The number of asymptotes in the root locus

Answer

Poles of the closed-loop transfer function directly

Question 5

What does the term 'observability' refer to in state-space control theory?

Accepted Answer

The ability to determine all internal states from output measurements

Answer

The ability to control all states via the input

Answer

The number of outputs in the system

Answer

The stability of the observer poles

Question 6

What is the steady-state error of a Type 1 system subjected to a unit ramp input?

Accepted Answer

1/Kv, where Kv is the velocity error constant

Answer

Zero

Answer

Infinity

Answer

1/Kp, where Kp is the position error constant