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

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.
All of these
None of these
it is impossible to write a control program for a machine in any other logic

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Automation System
What is the difference between integral and derivative control?

integral control has slower response to an error signal.
derivative control responds to a change in the rate of change in the error signal
derivative control does not eliminate offset error
All of these
None of these

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