Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

technical assistance must be provided to the user.
the system must make provision for new techniques.
None of these
the user must have access to both hardware and software
there should be a common 3-D part description system.

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

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

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