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

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

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Automation System
Straight-line operations:

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

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Automation System
Numerical control:

applies only to milling machines
is a method for controlling the operation of a machine by means of a set of instructions
None of these
All of these
is a method for producing an exact number of parts per hour

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