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

All of these
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
it is impossible to write a control program for a machine in any other logic

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Automation System
The program execution time:

will vary depending on the language used
All of these
None of these
cannot be changed once the program is written
must be slower than the fastest mechanical operation that is to be controlled

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

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

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