Automation System
Numerical control:

None of these
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
applies only to milling machines
All 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
both (b) and (c)
results in a binary code as the final output
has to be sampled at 1/2 the highest input frequency
None of these

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