Automation System
The concept of a general CAD system was that it should provide:

A system for handling user actions.
A system for the operation of applications programming.
None of these
All of these
A set of basic system functions and utilities.

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

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

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Automation System
Today, programmable controllers:

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

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