Root Locus - Control System Multiple Choice Questions and Answers


46.  The root locus is the part of roots of the characteristic equation traced out in the S plane. Which one of the following is correct ?


   A. As the input of the system is changed

   B. As the output of the system is changed

   C. As a system parameter is changed

   D. As the sensitivity is changed


✔ View Answer


C. As a system parameter is changed

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47.  A control system has G ( s ) H ( s ) = K / [ s ( s + 4 ) ( s2 + 4s + 20 ) ( 0 < K )< ∞ ) What is the number of breakaway points in the root locus diagram ?


   A. One

   B. Two

   C. Three

   D. Zero


✔ View Answer


C. Three

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48.  For root loci which of the following are the starting points?


   A. Open loop zeros

   B. Closed loop zeros

   C. Closed loop poles

   D. Open loop poles


✔ View Answer


D. Open loop poles

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49.  At which of the following root loci will end ?


   A. Open loop zeros

   B. Closed loop zeros

   C. Closed loop poles

   D. Open loop poles


✔ View Answer


A. Open loop zeros

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50.  The root loci of a system has three asymptotes. The system can have


   A. Five poles and two zeros

   B. For pole and one zero

   C. Three poles

   D. All of the above


✔ View Answer


D. All of the above

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