Automation System
The Ziegler-Nichols method:

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

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Automation System
The use of specialized workstations:

reduces the host computer workload and allows more users
provides limited growth potentials for 3-D
reduces the host computer workload
None of these
has a high cost-performance tradeoff

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