Root Locus - Control System Multiple Choice Questions and Answers

6.  The root locus of the plots of the variations of the poles of the closed loop system function with changes in

   A. Open loop gain

   B. Open loop poles

   C. Closed loop zeros

   D. None of the above

7.  What is the number of root locus segments which do not terminate on zeros?

   A. The number of poles

   B. The number of zeros

   C. The difference between the number of holes and the number of zeros

   D. The sum of the number of poles and the number of zeros

8.  For the equation, s³ - 4s² + s + 6 = 0 the number of roots in the left half of s-plane will be

   A. Zero

   B. One

   C. Two

   D. Three

9.  How many roots with positive real parts do the equation s³ + s² + s + 1 = 0 have ?

   A. Zero

   B. One

   C. Two

   D. Three

10.  Which one of the following open-loop transfer functions has root locus parallel to imaginary axis?

   A. k / ( s + 1 )

   B. k / ( s + 1 ) / ( s + 1 )²

   C. k / ( s + 1 )²

   D. k / ( s + 12) / ( s + 1 )²

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