Automation System
The Ziegler-Nichols method:

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

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Automation System
The SKETCHPAD system

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

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