Cascade control is best described as:
a. a collection of instruments that work together to automatically control a process
b. enhances controller output by increasing the output in relationship to the changing process variable.
c. describes the scaling factor used to take a controller from 0% to 100% output.
d. a term used to describe how one control loop controls or overrides the instructions of another control loop in order to achieve a desired set point.
Answer: d
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