Question

c) An open-opstem is a process with p-only control with no controller without a controller with two or more manipulated variables (d) The final control element is was a control valve in the instrument that changes the disturbance variable the instrument that gives signal to the controller jy the instrument that changes the manipulated variable (e) For proportional control, the larger the proportional band i the higher the sensitivity of the controller's signal to deviation in the lower the sensitivity of the controller's signal to deviation in the larger the value of the proportional constant in the larger integral time constant ( Rise time is i the time required for the process output to reach its first maximum value in the time required for the process output to first reach the final steady state value il the time required for the process output to reach and remain inside a band of a specific width of t 8 of the total change in y iv the time between successive peaks or two successive valleys of the response (8) In feed forward controller: i corrective action occurs regardless of the source of disturbance ii. corrective action is taken before a deviation in the controlled variable occurs ill. corrective action is taken for changes in set point iv. is not useful if there is a large delay in the deviation variable effect (h) The dynamic model designed transfer function of the feed forward controller, shown in the figure, is

Answer 1

Option c--- see open system there is no feedback means no comparator means no control to control the system

Means option iii

Question d-- manipulated variable are changed whenever. Ontroller asks it to change to keep control in check

Option iv

Question e-- larger the proportional band smaller the kc value of proportional control means less sensitive it is to error

Option ii

Question f-- option ii first time it reaches a steady state value

Question g-- option b