Automation System
A venturi tube:

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

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Automation System
What is offset error?

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

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Automation System
What is the difference between integral and derivative control?

derivative control responds to a change in the rate of change in the error signal
All of these
derivative control does not eliminate offset error
integral control has slower response to an error signal.
None of these

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