Automation System
The Ziegler-Nichols method:

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

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Automation System
Today, programmable controllers:

are relatively low cost compared with the original digital equipment available for industrial control
All of these
are more powerful then the first controllers on the market
can be cost effective even when replacing just a few relays
None of these

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Automation System
A stepping motor;

has a commutator
is a good choice where continuous rotation is needed
has a speed proportional to voltage input
None of these
can index positional movement.

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