Automation System
A semi-continuous operation means:

each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these
coffee breaks are allowed for the operator
a computer is a required part of the machine
the operation is continuous each shift, but stops between shifts

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

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

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