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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Automation System
Light sensors:

None of these
cannot be used a s limit switches.
never use infrared light as light source
come in a wide variety of mounting styles
work in direct sunlight

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

None of these
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
All of these
it is the best industrial control language ever developed.

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