Q. Given a plant which cannot be altered by the designer, the disturbance variable refer to a variable:

A
That influences the plant and which can be manipulated
B
That influences the plant but cannot be manipulated
C
That we wish to control
D
That is measured by means of a sensor
Solution:

A process variable, process value or process parameter is the current measured value of a particular part of a process which is being monitored or controlled. The current temperature is called the process variable, while the desired temperature is known as the set-point

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