Automation System
Using a microcomputer as a controller allows:

faster cycle time
None of these
All of these
simpler mechanical hardware
more self diagnostics of the machine operation

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Automation System
Stepping motors:

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

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Automation System
A dc servo motor:

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

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