Automation System
In pen plotters, "resolution" refers to the shortest possible line, but in electrostatic plotters it refers to:

the speed per inch
dual-axis tracking
how accurately the plotter returns to a specific point
None of these
the number of dots per inch

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Automation System
Digital signals:

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

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