Automation System
The Ziegler-Nichols method:

None of these
is a graphical solution method
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
Time proportioning control:

can be used on a PM550 programmable process controller
None of these
cannot use a TM990 micro¬computer
a and b above.
is less efficient than normal PID control

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