ISA CCST Level III Practice Questions - ISA Certified Control Systems Technician (CCST) Level III Master Exam

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In a cascade control configuration, what is the PRIMARY reason the secondary (inner) loop must be significantly faster than the primary (outer) loop?

To allow the secondary loop to reject disturbances before they affect the primary variable, and to prevent interaction between the two loops To reduce wiring costs To simplify the P&ID drawing To reduce the number of alarms

Correct Answer:

To allow the secondary loop to reject disturbances before they affect the primary variable, and to prevent interaction between the two loops

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