For the given system, how can be steady state error produced by step d...
The steady state error can be reduced by increasing the gain of the system. This is because the gain of the system determines how much the system responds to disturbances. A higher gain will result in a smaller steady state error.
However, increasing the gain of the system can also make the system unstable. This is because a higher gain can lead to oscillations in the system output. Therefore, it is important to increase the gain of the system carefully, and to make sure that the system remains stable.
In the given system, the steady state error produced by a step disturbance can be reduced by increasing the dc gain of G1(s). This is because G1(s) is the transfer function of the plant, and the plant is the part of the system that is responsible for responding to disturbances. A higher gain of G1(s) will result in a smaller steady state error.
Option a) is incorrect because increasing the dc gain of G1(s) G2(s) will not necessarily reduce the steady state error. In fact, it could make the system unstable.
Option b) is incorrect because increasing the dc gain of G2(s) will not affect the steady state error. G2(s) is the transfer function of the controller, and the controller is not responsible for responding to disturbances.
Option d) is incorrect because removing the feedback will make the system unstable. Feedback is necessary to stabilize the system.
Therefore, the correct answer is option c).