Automation System
Most current PC CAD systems are used for producing:

circuit simulation
None of these
finite element analysis
2-D drawings
solids modeling

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Automation System
Stepping motors:

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
do not require commutators

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Automation System
Light sensors:

work in direct sunlight
cannot be used a s limit switches.
come in a wide variety of mounting styles
None of these
never use infrared light as light source

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