A unity feedback system has the open-loop transfer function G(s) = 1(s – McqOptions

MCQOPTIONS

1.

A unity feedback system has the open-loop transfer function
G(s) = 1
(s 1)(s + 2)(s + 3)

The Nyquist plot of G(s) encircles the origin

A.

never

B.

once

C.

twice

D.

thrice

Answer» C. twice

Discussion

No Comment Found

Related MCQs

Consider a unit feedback control system with open-loop transfer function <br>G (s) = K/ [s (s + 1)]. <br>The steady state error of the system due to a unit step input is
Bode plot of a stable system is shown in figure below. The transfer function of the system is
Given: KK<sub>1</sub> = 99; s = j<sub>1</sub> rad/s, the sensitivity of the closed-loop system (shown in the figure) to variation in parameter K is approximately
The state representation of a second order system is <br>x<sub>1</sub> = x<sub>1</sub> u, x<sub>2</sub> = x<sub>1</sub> 2x<sub>2</sub> + u <br>Consider the following statements regarding the above system: <br>1. The system is completely state controllable. <br>2. If x<sub>1</sub> is the output, then the system is completely output controllable. <br>3. If x<sub>2</sub> is the output, then the system is completely output controllable. Of these statements
The number of roots of s<sup>3</sup> + 5 s<sup>2</sup> + 7 s + 3 = 0 in the left half of the s-plane is
The maximum phase shift that can be provided by a lead compensator with transfer function <br><table><tr><td rowspan="2">G<sub>c</sub>(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1 + 6s</center></td></tr><tr><td style="text-align: center;">1 + 2s</td></tr></table><br>is
An integral controller is used to improve the transient response of a first order system. If G (s) = 1/1 + s and the system is operated in closed-loop with unity feedback, what is the value of T<sub>i</sub> if integral controller transfer function is 1/T<sub>i</sub> s to provide damping ratio of 0.5?
The open loop transfer function of a unity feedback control system is given by: <br><table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td></tr><tr><td style="text-align: center;">s(s + 1)</td></tr></table><br> If the gain K is increased to infinity, then the damping ratio will tend to become
A process with open-loop model <br><table><tr><td rowspan="2">G(s) =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>Ke<sup> sT4</sup></center></td></tr><tr><td style="text-align: center;"> s + 1</td></tr></table><br>is controlled by a PID controller. For this process
The first two rows of Routh s tabulation of a fourth-order system are <br>s<sub>4</sub> 1 10 5 <br>s<sub>3</sub> 2 20 <br>The number of roots of the system lying on the right half of s-plane is