Automation System
A sequence controller:

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

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Automation System
Stepping motors:

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

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Automation System
The main function(s) of computer in CAD is/are

To serve as an extension to the memory of the designer
All of these
To relieve the designer from routine repetitious tasks.
None of these
To enhance the analytical and logical power of the designer

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