Automation System
The main activity(ies) of Designer in CAD is/are:

Application of creativity, ingenuity, and experience.
All of these
Organisation of design information
Control of the design process in information distribution.
None of these

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Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
have a frequency measured in units of hertz
None of these
have a sinusoidal shape.
can have three possible levels

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Automation System
Stepping motors:

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

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