Automation System
Time proportioning control:

None of these
is less efficient than normal PID control
cannot use a TM990 micro¬computer
a and b above.
can be used on a PM550 programmable process controller

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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
integral control has slower response to an error signal.
None of these
derivative control does not eliminate offset error
All of these

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