The plural of the locus is loci.The area of the loci is called the region.The word locus is derived from the word location. a) 1 This contains 20 Multiple Choice Questions for Electrical Engineering (EE) Test: The Root Locus And Its Concepts (mcq) to study with solutions a complete question bank. c) dBase Root Locus method is a widely used graphical technique to analyze how the system roots vary with variation in particular parametric quantity, generally a gain in a feedback control system. 0=−12[(1−ur2)2+(2δur)2]−32[4ur(ur2−1+2δ2)] ⇒4ur(ur2−1+2δ2)=0 ⇒ur2−1+2δ2=0 ⇒ur2=1−2δ2 ⇒ur=1… If the gain of the system is reduced to a zero value, the roots of the system in the s-plane. Root locus of s(s+2)+K(s+4) =0 is a circle. Answer: d Figure 8 shows the Step Response of the closed-loop system for K p =51.2 and ξ=0.4, and the values of the main parameters: This arises because of the angle criterion (Eq. At ω=ωr, the first derivate of the magnitude of T(jω)is zero. Concept of Root Locus 2. The addition of open loop zero pulls the root loci towards: The left and therefore system becomes more stable, The right and therefore system becomes unstable, Imaginary axis and therefore system becomes marginally stable, The left and therefore system becomes unstable. c) 0 This mock test of Test: The Root Locus And Its Concepts for Electrical Engineering (EE) helps you for every Electrical Engineering (EE) entrance exam. b) -1 This Complex Numbers Worksheet has total 20 Questions in Multiple Choice Format. Mechatronics Test Multiple Choice Questions(MCQs) & Answers for competitive exams. a) True You can find other Test: The Root Locus And Its Concepts extra questions, Figure 7 shows that we can get a damping ratio ξ=0.4. - Published on 09 Oct 15 The interesting part about X-axis is the distance between 1 and 2 is greater than the distance between 2 and 3 and so on. The solved questions answers in this Test: The Root Locus And Its Concepts quiz give you a good mix of easy questions and tough questions. If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be: Root loci can be used for analyzing stability and transient performance, Root loci provide insight into system stability and performance, Shape of the root locus gives idea of type of controller needed to meet design specification, Root locus can be used to handle more than one variable at a time. Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the … G(s)H(s) =K(s+b)/s(s+a) ... 2 + 2ω2 Ans: (C) Q.3 Considering the root locus diagram for a system with K(s + 5) G(s) = , the meeting point of the asymptotes on the real s(s + 2) (s + 4) (s2 + 2s + 2) axis occurs at . Answer: d 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. When the initial conditions of a system are specified to be zero it implies that the system is (a) at rest without any energy stored in it (b) working normally with reference input (c) working normally with zero … The breakaway point calculated mathematically must always lie on the root locus. As the input of the system is changed . The output signal is fed back at the input side from the _____point a. Summing b. View Answer, 9. c) As a system parameter is changed a) Root locus method b) Nyquist method c) Bode plot d) M and N circle. 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. The addition of open loop zero pulls the root loci towards: Mechatronics Test Multiple Choice Questions(MCQs) & Answers for competitive exams. (c) Root locus design (d) State model representatives Ans: d. 93. a) 0 Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K.Now suppose we introduce a zero in the open loop transfer function at -3, while … b) The saturation voltage V CE for germanium transistor is more than silicon transistor. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “The Root Locus”. Home; About Us; Contact Us; 0 c. 1 d. ∞ 6) Gas chromatography is used for measurement of a. temperature b. pressure c. concentration d. flow rate Root Locus Diagram's Previous Year Questions with solutions of Control Systems from GATE ECE subject wise and chapter wise with solutions Which of the following is exhibited by Root locus diagrams ? c) Move away from poles 9. The open loop poles of a third order unity feedback system are at 0,-1,-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. 1+K(s+4)/s(s+2) =0. Explanation: The addition of open loop poles pulls the root locus towards the right and system becomes unstable. Answers Keys are given at the end of this sheet. If the gain of the critical damped system is increased it will behave as_____? 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. Similarly, on such scale distance between 1 and 10 is equal to the distance between 10 and 100 or between 100 and 1000 and so on. Explanation: The root locus is the locus of the change of the system parameters of the characteristic equation traced out in the s-plane. Which one of the following is not the property of root loci? Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K.Now suppose we introduce a zero in the open loop transfer function at -3, while … Angle and Magnitude Condition for a … A. oscillatory ... PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. Break away point c. Stability point d. Anti-break point Explanation: Centroid =Sum of real part of open loop pole-sum of real part of open loop zeros/P-Z. What are the coordinates of the center of this circle? Root Locus method is a widely used graphical technique to analyze how the system roots vary with variation in particular parametric quantity, generally a gain in a feedback control system. a) LISP Explanation: The system can become stable by reducing the damping and also by adding zeroes in the s plane and moving left of the s plane system becomes more stable. Segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd. c) The difference between the number of poles and zeroes Ellipse is the part of Syllabus of Class 11th CBSE. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. d) Segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd. 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