Automation System
Relay ladder logic is used in a PC because:

All of these
None of these
it is the best industrial control language ever developed.
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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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
None of these
it simplifies the trial-and-error method
tool motions can be checked to see if there is interference between the tool and the object
there is better coordination in the materials-handling area

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