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

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

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Automation System
The main function(s) of computer in CAD is/are

To enhance the analytical and logical power of the designer
To serve as an extension to the memory of the designer
To relieve the designer from routine repetitious tasks.
All of these
None of these

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