Automation System
A stepping motor;

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

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Automation System
Straight-line operations:

None of these
must be limited to two per workpiece
must be parallel to one of the axes of the coordinate system
can include diagonal cuts if they aren't curved
All of these

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Automation System
A venturi tube:

measures the presence of a liquid
is extremely difficult to use
can be used to measure gas or liquid flow rates
None of these
is made only of metal

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