Automation System
The axis of movement of a robot may include:

None of these
X-Y coordinate motion
elbow rotation
Wrist rotation
All of these

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Automation System
Stepping motors:

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

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Automation System
A stepping motor;

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

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