Automation System
The two types of relays in a PC are:

a control relay and a retentive relay
None of these
an output relay and a control relay
All of these
a retentive relay and a non-retentive relay

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Automation System
Straight-line operations:

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

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Automation System
Digital signals:

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

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