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

a control relay and a retentive relay
All of these
an output relay and a control relay
None 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
All of these
must be parallel to one of the axes of the coordinate system
must be limited to two per workpiece
None of these

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Automation System
D/A (digital to analog) conversion:

must be fed through a filter to reproduce the original signal accurately
results in a binary code as the final output
has to be sampled at 1/2 the highest input frequency
both (b) and (c)
None of these

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