Today’s automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional’s skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. The following question comes from the CAP study guide, Performance Domain VI, Operations and Maintenance. Long-term support of the system.
If diagnostic software flags a controller as having high process variability when its output is hitting a low limit, the MOST probable cause is a(n):
a) zero shift in the measurement
b) noisy measurement
c) nonlinear control valve
d) oversized control valve
e) none of the above