Controller - Control System Multiple Choice Questions and Answers


31.  The input to a controller is


   A. Sensed signal

   B. Error signal

   C. Desired variable value

   D. Signal of fixed amplitude not dependent on desired variable value


✔ View Answer


B. Error signal

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32.  Which one of the following is a disadvantage of proportional controller?


   A. It destabilises the system

   B. It produces offset

   C. It makes response faster

   D. It has very simple implementation


✔ View Answer


A. It destabilises the system

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33.  For a linear time invarient system, an optimal controller can be designed if


   A. The system is controllable and observable

   B. The system is uncontrollable but stable

   C. The system is unstable but observable

   D. The system is stable but unobservable


✔ View Answer


A. The system is controllable and observable

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34.  A first order dynamic linear system with a proportional controller exhibits an offset to a unit step input. The offset can be reduced by


   A. Decreasing the proportional gain

   B. Adding derivative mode

   C. Adding integral mode

   D. Increasing the proportional gain


✔ View Answer


C. Adding integral mode

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35.  The transfer function of a P-I controller is


   A. Kp + Ki/s

   B. Kp + ( Ki/s )

   C. ( Kp/s ) + Ki . s

   D. Kp . s + ( Ki/s )


✔ View Answer


B. Kp + ( Ki/s )

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