Automation System
What is offset error?

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

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Automation System
A venturi tube:

is extremely difficult to use
measures the presence of a liquid
None of these
is made only of metal
can be used to measure gas or liquid flow rates

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