Automation System
A stepping motor;

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

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Automation System
Speech recognition:

None of these
All of these
is already widely used in industrial controls
will never be used in industrial controls
will be used in more applications as the technology matures.

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Automation System
A sequence controller:

None of these
is a mechanical only controller
is difficult to program
is no longer in widespread use
performs on/off control functions in relation to time.

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