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

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

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Automation System
Programmable controllers:

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

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