Automation System
The Ziegler-Nichols method:

is a graphical solution method
can be used to determine gain factors of a PI loop
a and b above
is a method of control
None of these

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Automation System
A semi-continuous operation means:

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

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