The Root Locus Concepts MCQ

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• Number of roots of characteristic equation is equal to the number of ______________
  ক

  Branches

  খ

  Root

  গ

  Stem

  ঘ

  Poles
• Consider the following statements regarding root loci:
  ক

  All root loci start from the respective poles of G(s) H(s)

  খ

  All root loci end at the respective zeros of G(s) H(s) or go to infinity

  গ

  The root loci are symmetrical about the imaginary axis of the s-plane

  ঘ

  All root loci start and end from the respective poles of G(s) H(s) or go to infinity
• Routh Hurwitz criterion is better than root locus.
  ক

  True

  খ

  False
• Root locus is used to calculate:
  ক

  Marginal stability

  খ

  Absolute stability

  গ

  Conditional stability

  ঘ

  Relative stability
• The addition of open loop poles pulls the root locus towards:
  ক

  The right and system becomes unstable

  খ

  Imaginary axis and system becomes marginally stable

  গ

  The left and system becomes unstable

  ঘ

  The right and system becomes unstable
• While increasing the value of gain K, the system becomes
  ক

  Less stable

  খ

  More stable

  গ

  Unstable

  ঘ

  Absolute stable
• The main objective of drawing root locus plot is :
  ক

  To obtain a clear picture about the open loop poles and zeroes of the system

  খ

  To obtain a clear picture about the transient response of feedback system for various values of open loop gain K

  গ

  To determine sufficient condition for the value of ‘K’ that will make the feedback system unstable

  ঘ

  Both b and c
• Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
  ক

  -2,0

  খ

  -3,0

  গ

  -4,0

  ঘ

  -5,0
• Which one of the following statements is not correct?
  ক

  Root loci can be used for analyzing stability and transient performance

  খ

  Root loci provide insight into system stability and performance

  গ

  Shape of the root locus gives idea of type of controller needed to meet design specification

  ঘ

  Root locus can be used to handle more than one variable at a time