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

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

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Automation System
A venturi tube:

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

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