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The transfer function for the disturbance response in an open-loop process is given by $G_{d}^{open}(s)$. The corresponding transfer function for the disturbance response in a closed-loop feedback control system with proportional controller is given by $G_{d}^{closed}(s)$. Select the option that is $ALWAYS$ correct {O[G(s)]represents order of transfer function G(s)} :

  1. $O\left \lfloor G_{d}^{open}\left ( s \right ) \right \rfloor=O\left \lfloor G_{d}^{closed} \left ( s \right )\right \rfloor$
  2. $O\left \lfloor G_{d}^{open}\left ( s \right ) \right \rfloor\neq O\left \lfloor G_{d}^{closed} \left ( s \right )\right \rfloor$
  3. $O\left \lfloor G_{d}^{open}\left ( s \right ) \right \rfloor\geq O\left \lfloor G_{d}^{closed} \left ( s \right )\right \rfloor$
  4. $O\left \lfloor G_{d}^{open}\left ( s \right ) \right \rfloor\leq O\left \lfloor G_{d}^{closed} \left ( s \right )\right \rfloor$

 

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