Automation System
The hardware device Jhat acts as both a switching and connecting unit is called a(n):

concentrator
multiplexer
communications processor
None of these
RS-232C port

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

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

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