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
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.
None of these
All of these

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Automation System
Trend analysis:

is a brand new concept
requires a very expensive system to implement
can improve control system response
is used only in financial planning
None of these

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