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 both clockwise and counterclockwise
can run at varying speeds

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Automation System
Most industrial control applications:

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

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Automation System
A dc servo motor:

can provide precise position control
None of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
All of these

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