Automation System
Computer-based controllers:

are very difficult to change
are very flexible
(a) and (c) above
should be built in a modular fashion wherever possible
None of these

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
All of these
the difference between the control setpoint value and the actual value.
None of these
the difference between the controller output and the setting of the manipulated variable.

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