Q. What is a control system? A. A control system consists of subsystems and processes (or plants) assembled for the purpose of obtaining a desired output with desired performance, given a specified input. Q. When is a control system said to be robust? A. control system is said to be robust when 1. It has low sensitivities 2. It is stable over a wide range of parameter variations; and 3. The performance stays within prescribed (but practical) limit bounds in presence of changes in the parameters of the controlled system and disturbance input. Q. What is the main difference between open loop and closed loop systems? A. Open-loop systems, do not correct for disturbances and are simply commanded by the input. The closed-loop system compensates for disturbances by measuring the output response, feeding that measurement back through a feedback path, and comparing that response to the input at the summing junction. If there is any difference between the two responses, the system drives...
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