Automation System
Stepping motors:

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

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Automation System
How is the integral mode implemented on a digital controller?

the error is divided into discrete amounts
the digital controller cannot handle integral mode
All of these
the error signal is summed over a discrete time interval and accumulated by the controller
None of these

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Automation System
A process controller:

All of these
None of these
is useful in a continuous process control application
can interface to digital and analog I/O
can solve a PID process control equation easily

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