Automation System
Time proportioning control:

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

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Automation System
What is the process lag?

The lag in the error signal when the setpoint is changed.
None of these
The time it takes for the sensor to respond to a changed.
The time it takes for the mass of the process to respond to an input change.
All of these

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