Automation System
How is the integral mode implemented on a digital controller?

All of these
None of these
the error is divided into discrete amounts
the error signal is summed over a discrete time interval and accumulated by the controller
the digital controller cannot handle integral mode

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Automation System
A venturi tube:

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

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