Automation System
The Ziegler-Nichols method:

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

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Automation System
The SKETCHPAD system

is expensive because it is sophisticated and make demands on the power and resources of the computer.
None of these
is used for interactive Graphics
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
All of these

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Automation System
Microcomputer-based control sys-tems

will tend to increase in cost.
will just keep their present capability
None of these
All of these
will have more standard industrial application software available in the future.

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