Automation System
One advantage of a PC in industrial control is that it:

has a reliable long life compared to relay logic
All of these
is very difficult for the inexperienced programmer to understand
is unreliable because there are no moving parts
None of these

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Automation System
One of the major benefits of using CAD in tool design is that:

product design represents approximately one-half the engineering costs
there is better coordination in the materials-handling area
it simplifies the trial-and-error method
tool motions can be checked to see if there is interference between the tool and the object
None of these

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