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Which of the following statements are $\text{CORRECT}$ for a controller?

  1. In a proportional controller, a control action is proportional to the error
  2. In an integral controller, a control action is proportional to the derivative of the error
  3. There is no “offset” in the response of the closed-loop first-order process with a proportional controller
  4. There is no “offset” in the response of the closed-loop first-order process with a proportional-integral controller

 

  1. $\text{P}$ and $\text{Q}$ Only
  2. $\text{P}$ and $\text{R}$ Only
  3. $\text{P}$ and $\text{S}$ Only
  4. $\text{Q}$ and $\text{S}$ Only
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