Automation System
The Ziegler-Nichols method:

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

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

University of Aston, Birmingham, 1960
None of these
Cranfield Institute of Technology, London, 1962
Massachusetts Institute of Technology in 1963
Imperial college of Science and Technology, London, 1973

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