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

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

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

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

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
All of these
None of these
are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market

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Automation System
Programmable controllers:

(a) and (c) above
are programmed using relay ladder logic
cannot perform functions other than relay logic
None of these
are widely used in many different industries

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