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.
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

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

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