Automation System
The Ziegler-Nichols method:

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

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Automation System
The SKETCHPAD system

is used for interactive Graphics
All of these
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.
None of these

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