Automation System
The Ziegler-Nichols method:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

None of these
technical assistance must be provided to the user.
the system must make provision for new techniques.
there should be a common 3-D part description system.
the user must have access to both hardware and software

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