Automation System
The Ziegler-Nichols method:

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

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Automation System
Most industrial control applications:

can be solved using more than one method of control
must have the process specified correctly to be successful
All of these
None of these
can be done more reliably using solid-state methods

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