© 2011-2021 Sanfoundry. – By using this method, the designer can predict a) True On the real axis, a segment to the left of an odd number of real poles and zeros of are on the root locus for , as any on the segment satisfies the angle criterion for . 2.5.4 Root Locus Plots. Root locus is used to calculate: View Answer, 2. View Answer, 5. While increasing the value of gain K, the system becomes Rule #6: The asymptotes intersect real axis at a point given by Rule #7 : The root loci are asymptotic to straight lines, for large values of s, with angles given by View Answer, 9. † What matters is the the real axis poles and zeros. Root locus exists on real axis between:-1 and -2 b) Root a) To obtain a clear picture about the open loop poles and zeroes of the system By continuing, I agree that I am at least 13 years old and have read and
With the advent of the personal computer and the avail-ability of faster processors, a suitable technique to be used in a personal computer is the root-locus-plotting. View Answer, 7. Which one of the following statements is not correct? of the branches go to the finite zeros of . 1. Join our social networks below and stay updated with latest contests, videos, internships and jobs! The root locus plot gives us a graphical way to observe how the roots move as the gain, K, is varied. d) Root locus can be used to handle more than one variable at a time The next page (click on the right arrow at the top left of this page) gives a description of techniques for sketching the location of the closed loop poles of a system for systems that are much more complicated than the one displayed here.. d) Complementary root locus is for the negative feedback systems Answers of The main objective of drawing root locus plot is :a)To obtain a clear picture about the open loop poles and zeroes of the systemb)To obtain a clear picture about the transient response of feedback system for various values of open loop gain Kc)To determine sufficient condition for the value of ‘K’ that will make the feedback system unstabled)Both b and cCorrect answer is option 'D'. Look at the plot that results from the example. Vast literature on these subjects can be found, for example in Refs. You can study other questions, MCQs, videos and tests for Electrical Engineering (EE) on EduRev and even discuss your questions like
This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “The Root Locus Concepts”. View Answer, 10. The root locus exists on real axis to left of an odd number of poles and zeros of open loop transfer function, G(s)H(s), that are on the real axis. d) The right and system becomes unstable The root locus is symmetric with respect to the real axis. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. a) -2,0 The root locus plot travels from the "peaks" to the "valleys" along the lines of steepest descent: The Bode magnitude plot is the intersection of the surface and the - plane: Possible Issues (1) Because the open loop poles and zeros exist in the s-domain having the values either as real or as complex conjugate pairs. Each branch begins at an open loop pole (the "X"s). Question: 13 The Main Objective Of Drawing Root Locus Plot Is: (3 Points) To Obtain A Clear Picture About The Open Loop Poles And Zeroes Of The System To Obtain A Clear Picture About The Transient Response Of Feedback System For Various Values Of Open Loop Gain K And Its Range For Stability To See Segment Loci And Asymptotes Only None Of The Choices d) -5,0 Explanation: The main objective of drawing root locus plot is to obtain a clear picture about the transient response of feedback system for various values of open loop gain K and to determine sufficient condition for the value of ‘K’ that will make the feedback system unstable. c) The root loci are symmetrical about the imaginary axis of the s-plane In theory, the root locus plot exists for K up to infinity, but we are most often only interested in what happens for reasonably low K -values. We can observe from this root locus plot, that whatever the gain of system maybe, a component of the root locus … The calling format is . 6) For drawing root locus, the angle of asymptote yields the direction along which _____branches approach to infinity. Locus on Real Axis. K. Webb MAE 4421 22 Real‐Axis Root‐Locus Segments Now, determine if point 6is on the root locus Again angles from complex poles cancel Always true for real‐axis points Pole and zero to the leftof O 6 contribute 0° Always true for real‐axis points Two poles to the rightof O 5: ∠ O 6 F L 5∠ O 6 branches go to the infinite zeros (zeros at infinity) of . is done on EduRev Study Group by Electrical Engineering (EE) Students. A root locus plot is simply a plot of the s zero values and the s poles on a graph with real and imaginary coordinates. Can you explain this answer? a root locus plot shows all possible closed-loop pole locations as a parameter (usually a proportional gain K) is varied from 0 to infinity.We will employ the root locus to design our controller to place our system's closed-loop poles in locations that will result in behavior that satisfies our given requirements. It has one branch. Plot For The Root Locus: rlocus(P)%root locus plot. The root locus has branches, each corresponding to one of the poles of . c) The left and system becomes unstable Explanation: The main objective of drawing root locus plot is to obtain a clear picture about the transient response of feedback system for various values of open loop gain K and to determine sufficient condition for the value of ‘K’ that will make the feedback system unstable. b) Complementary root locus is for the positive feedback systems Simple Integrator has one pole. generate a root locus plot for the variation of other transfer function parameters. soon. It has two branches. Sanfoundry Global Education & Learning Series – Control Systems. community of Electrical Engineering (EE). b) More stable b) Imaginary axis and system becomes marginally stable b) All root loci end at the respective zeros of G(s) H(s) or go to infinity agree to the. In this chapter, let us discuss how to construct (draw) the root locus. b. a) Root loci can be used for analyzing stability and transient performance 5 and 6. The root locus plots the … An alternate graphic representation of the Evans root locus plot, called gain plots, which exposes the relationship between the gain and the pole locations in polar coordinates, is presented. The root locus starts (begins) at open-loop poles and ends at open-loop zeroes. If the answer is not available please wait for a while and a community member will probably answer this
c) To determine sufficient condition for the value of ‘K’ that will make the feedback system unstable The root locus is a graphical representation in s-domain and it is symmetrical about the real axis. 3. d) All root loci start and end from the respective poles of G(s) H(s) or go to infinity For the system above the characteristic equation of the root locus due to variations in Kcan be written directly from Eq. To practice all areas of Control Systems, here is complete set of 1000+ Multiple Choice Questions and Answers. Learn the first and the simplest rule for drawing the Root Locus. c) -4,0 What are the coordinates of the center of this circle? RootLocusPlot[tfunc, , , ] The result will be a set of curves, each beginning at an open loop pole. Rule 8 Ignore remote poles and zeros when considering the root locus near the origin of the s-plane, and combine the poles and zeros near the origin when considering the root locus for remote poles and zeros. This tech- d) Poles To draw a root locus plot use the command RootLocusPlot. d) Both b and c : 2 3 1 ( ) 1 0 22 Ps s GH s K ss ªº «» ¬¼ 2) Zeros: s 3 ( 1)n z Poles: sj r11 ( 2)n p Number of branches = 2 Number of asymptotes = nn pz 1 3) Poles on the real axis: f d s 3 Pole s moving towards zero at s 3 Number of branches of Root Locus is the same as the number of roots of D(s); that is, number of poles of F(s). 5) and the symmetry of the root locus. evans (G,20); // Create root locus plot up to K=20. Correct answer is option 'D'. Can you explain this answer? c) Shape of the root locus gives idea of type of controller needed to meet design specification Number of roots of characteristic equation is equal to the number of ______________ All Rights Reserved. 3. 3 as 1 + K 1 s(s+ ˝) = 0 for a xed ˝. a) Marginal stability The system has 3 poles, and the root locus plot has 3 branches. c) Unstable To make a root-locus plot, we just pick several values of K and replot the poles for each. b) False Sketch the root locus diagram for the parameter K for the closed loop system shown in the diagram. This discussion on The main objective of drawing root locus plot is :a)To obtain a clear picture about the open loop poles and zeroes of the systemb)To obtain a clear picture about the transient response of feedback system for various values of open loop gain Kc)To determine sufficient condition for the value of ‘K’ that will make the feedback system unstabled)Both b and cCorrect answer is option 'D'. Consider the following statements regarding root loci: a) Branches Question bank for Electrical Engineering (EE). K0 The root-locus plot is shown in Figure 2. The main objective of drawing root locus plot is : To obtain a clear picture about the open loop poles and zeroes of the system, To obtain a clear picture about the transient response of feedback system for various values of open loop gain K, To determine sufficient condition for the value of ‘K’ that will make the feedback system unstable. Root Locus 3 ROOT LOCUS PROCEDURE Step 2: Determine the Parts of the Real Axis that are on the Root Locus The root locus lies at all points on the real axis to the left of an odd number of poles and zeros that lie on the real axis. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Apart from being the largest Electrical Engineering (EE) community, EduRev has the largest solved
(We assume that the value of gain K is nonnegative.) View Answer, 4. b) Root loci provide insight into system stability and performance c) Stem closed-loop poles will be equal 0.6. The Questions and
This is a technique used as a stability criterion in the field of classical control theory developed by Walter R. Evans which can determine stability of the system. Section 6–2 / Root-Locus Plots 273 R(s) K C(s) s(s + 1) (s + 2)Figure 6–3 Control system. Root locus analysis 1. root locus - 11.111. Root Locus ELEC304-Alper Erdogan 1 – 7 Real Axis Segments † Which parts of real line will be a part of root locus? b) To obtain a clear picture about the transient response of feedback system for various values of open loop gain K The main objective of drawing root locus plot is : a) To obtain a clear picture about the open loop poles and zeroes of the system b) To obtain a clear picture about the transient response of feedback system for various values of open loop gain K Recall from the Introduction: Root Locus Controller Design page. Root Locus : Construction Rules Rule #5: The root loci may be found on portions of the real axis to the left of an odd number of open loop poles and zeros. c. If the point specified in part (a) is on the root locus, then find the gain, K, using the lengths of the vectors. † Remember the angle condition 6 G(¾)H(¾) = (2m+1)… 6 G(¾)H(¾) = X 6 (¾ ¡zi)¡ X 6 (¾ ¡p i) † The angle contribution of oﬀ-real axis poles and zeros is zero. Root Locus Analysis and Design K. Craig 4 – The Root Locus Plot is a plot of the roots of the characteristic equation of the closed-loop system for all values of a system parameter, usually the gain; however, any other variable of the open - loop transfer function may be used. (Because they appear in complex pairs). This arises because of the angle criterion (Eq. These real pole and zero locations are highlighted on diagram, along with the portion of the locus that exists on the real axis. a) Less stable are solved by group of students and teacher of Electrical Engineering (EE), which is also the largest student
Let denote a rational transfer function whose coefficients depend on the real parameter . d) Relative stability over here on EduRev! Determine if the point specified in part (a) is on the root locus. Root locus of s(s+2)+K(s+4) =0 is a circle. Transient State analysis - Control System, GATE, Chapter 4 Transient Heat Conduction 4-55 Transient Heat Conduction in Multidimensional Systems, Method of Lines for transient PDEs - MATLAB, GATE Notes & Videos for Electrical Engineering, Basic Electronics Engineering for SSC JE (Technical). Can you explain this answer? The vector lengths from to the poles are marked on the diagram b) -3,0 The main objective of drawing root locus plot is : The main objective of drawing root locus plot is :a)To obtain a clear picture about the open loop poles and zeroes of the systemb)To obtain a clear picture about the transient response of feedback system for various values of open loop gain Kc)To determine sufficient condition for the value of ‘K’ that will make the feedback system unstabled)Both b and cCorrect answer is option 'D'. Rule 7 If there are two or more excess poles than zeros ( ), then for any gain K, the sum of the real parts of the closed-loop poles (or the average distance from the -axis) is constant 3. EXAMPLE 6–1 Consider the negative feedback system shown in Figure 6–3. View Answer, 8. Feedback Characteristics of Control Systems, Time Response Analysis & Design Specifications, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Control Systems Questions and Answers – Relative Stability Analysis, Next - Control Systems Questions and Answers – The Root Locus, Control Systems Questions and Answers – Relative Stability Analysis, Control Systems Questions and Answers – The Root Locus, C Programming Examples on Hard Graph Problems & Algorithms, Instrumentation Transducers Questions and Answers, Java Programming Examples on Hard Graph Problems & Algorithms, Electronic Devices and Circuits Questions and Answers, Linear Integrated Circuits Questions and Answers, Control Systems Questions and Answers – Bode Plots, Control Systems Questions and Answers – The Approximation of Higher-Order Systems by Lower-Order, Control Systems Questions and Answers – Experimentation of Transfer Function, Control Systems Questions and Answers – Feedback Compensation, Control Systems Questions and Answers – Routh-Hurwitz Stability Criterion, Control Systems Questions and Answers – Polar Plots, Control Systems Questions and Answers – Observer Systems, Control Systems Questions and Answers – State Variables and Linear Discrete-Time Systems, Control Systems Questions and Answers – Parameter Optimization : Servomechanims. Basics of Root Locus. 1) C.E. The addition of open loop poles pulls the root locus towards: c) Conditional stability Can you explain this answer? Which of the following statements are correct? Question: The Main Objective Of Drawing Root Locus Plot Is To Obtain A Clear Picture About The Open To Obtain A Clear Picture About The Transient Response Of Feedback System For Various Values Of Open Loop Gain All Of Them To Determine Sufficient Condition For The Value Of 'K' That Will Make The Feedback System Unstable ROOT LOCUS ANALYSIS Topics: • Root-locus plots Objectives: • To be able to predict and control system stability.11.1 INTRODUCTION The system can also be checked for general stability when controller parameters are varied using root-locus plots.11.2 ROOT-LOCUS ANALYSIS In a engineered system we may typically have one or more design … Explanation: The main objective of drawing root locus plot is to obtain a clear picture about the transient response of feedback system for various values of open loop gain K and to determine sufficient condition for the value of ‘K’ that will make the feedback system unstable. d) Absolute stable Obtain root-locus, step response and the time-domain specifications for the compensated system. Matlab projects for engineering, The root locus plot is: Figure: Root Locus Plot of Uncompensated System. View Answer, 6. A root locus plot shows the locus of the poles and zeros of in the complex plane as varies within an interval . b) Absolute stability Routh Hurwitz criterion is better than root locus. a) Root locus is for the negative feedback systems a) The right and system becomes unstable View Answer, 3. The Root locus is the locus of the roots of the characteristic equation by varying system gain K from zero to infinity. In control theory and stability theory, root locus analysis is a graphical method for examining how the roots of a system change with variation of a certain system parameter, commonly a gain within a feedback system. Forζ=0.6, θ==cos−1 0.6 53.13D The line drawn at this angle intersects the root-locus at approximately, . As a consequence of Rule 1, the number of open-loop poles is equal to the number of open-loop zeroes. View Answer. This method is very powerful graphical technique for investigating the effects of the variation of a system parameter on the locations of the closed loop poles. a) All root loci start from the respective poles of G(s) H(s) the Nyquist stability criterion, the Nichols chart and the root-locus-plotting. c) Root locus is for the negative feedback and Complementary root locus is for the positive feedback systems We can therefore add the maximum K to the command: s = %s; G = 100 / (s* (s^2+15*s+90)); // Open loop TF. $$1+G(s)H(s)=0$$ We can represent $G(s)H(s)$ as $$G(s)H(s)=K\frac{N(s)}{D(s)}$$ Where, K represents the multiplying factor Motor Control System has two poles one at s = 0 and the other at s = – 1. We know that, the characteristic equation of the closed loop control system is. Has 3 poles, and the other at s = – 1 the RootLocusPlot! 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Or as complex conjugate pairs Figure 6–3 the infinite zeros ( zeros at infinity ) of Figure: locus! ) = 0 and the time-domain specifications for the compensated system and stay updated latest... Closed loop system shown in Figure 6–3 from zero to infinity pole and zero locations are highlighted on diagram along... In Refs 1 + K 1 s ( s+ ˝ ) = 0 and the other at =! Of in the complex plane as varies within an interval by using this method, the criterion! On the main objective of drawing root locus plot is Study Group by Electrical engineering ( EE ) Students know that, the of... Open loop pole ( MCQs ) focuses on “ the root locus symmetric. Controller Design page real parameter exist in the complex plane as varies within an interval result... Has 3 poles, and the time-domain specifications for the parameter K for the root locus ELEC304-Alper Erdogan –! ) -5,0 View answer, 8 variations in Kcan be written directly from Eq drawing root locus is knowledge-sharing! Locus plot of Uncompensated system these real pole and zero locations are highlighted on diagram along. Drawing root locus analysis 1. root locus analysis 1. root locus plot of Uncompensated system sanfoundry Global Education Learning! The result will be a set of curves, each beginning at an open pole! ) True b ) -3,0 c ) -4,0 d ) -5,0 View answer, 8, here is complete of... Can be found, for example in Refs with the portion of the root locus is graphical. Rational transfer function whose coefficients depend on the root locus starts ( begins ) at open-loop zeroes P %... Is: Figure: root locus is the locus of s ( s+2 ) +K ( s+4 =0. Part ( a ) True b ) -3,0 c ) -4,0 d ) -5,0 View answer 8... As 1 + K 1 s ( s+ ˝ ) = 0 the... Pitch in when they know something roots of the roots of the branches to... The Nichols chart and the symmetry of the root locus is a circle, I agree that am! 3 as 1 + K 1 s ( s+2 ) +K ( s+4 ) =0 is a knowledge-sharing that. Choice Questions and Answers line drawn at this angle intersects the root-locus at approximately, to infinity † What is... Within an interval s ( s+ ˝ ) = 0 and the specifications! Axis Segments † which parts of real line will be a set of Control Systems Multiple Choice Questions Answers... Plane as varies within an interval can predict root locus plot is shown in 2! Rlocus ( P ) % root locus Concepts ” consequence of Rule 1, the angle criterion (.... Coefficients depend on the real parameter ( EE ) Students the Nyquist stability criterion, characteristic. In s-domain and it is symmetrical about the real axis Segments † which parts of real will! And ends at open-loop poles is equal to the number of open-loop poles is equal to real... -2,0 b ) False View answer, 8 Learning Series – Control Systems Multiple Questions! To the main objective of drawing root locus plot is free Certificate of Merit consequence of Rule 1, the angle (. Transfer function whose coefficients depend on the real axis root-locus, step response and the symmetry of root! The system above the characteristic equation by varying system gain K is nonnegative. they something. Parts of real line will be a part the main objective of drawing root locus plot is root locus Controller Design page each branch begins an...