Automation System
The Ziegler-Nichols method:

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

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Automation System
Stepping motors:

can be built to index different amounts by changing the pole configuration
do not require commutators
All of these
can run at varying speeds
can run both clockwise and counterclockwise

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