Automation System
Digital signals:

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

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Automation System
A dc servo motor:

None of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
can provide precise position control
All of these

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Automation System
Straight-line operations:

All of these
must be limited to two per workpiece
must be parallel to one of the axes of the coordinate system
None of these
can include diagonal cuts if they aren't curved

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