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Cascade control is | |
A. | the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller. [Wrong Answer] |
B. | used when changes in process conditions cause serious upsets in the controlled variable. [Wrong Answer] |
C. | useful to control flow from temperature. [Wrong Answer] |
D. | all 'a', 'b' & 'c'. [Correct Answer] |