Automation System
Numerical control:

All of these
is a method for controlling the operation of a machine by means of a set of instructions
applies only to milling machines
None of these
is a method for producing an exact number of parts per hour

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Automation System
A stepping motor;

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

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Automation System
Stepping motors:

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

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