Automation System
Today, programmable controllers:

All of these
are relatively low cost compared with the original digital equipment available for industrial control
can be cost effective even when replacing just a few relays
are more powerful then the first controllers on the market
None of these

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

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

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