Automation System
Time proportioning control:

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

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Automation System
What is the process lag?

All of these
The lag in the error signal when the setpoint is changed.
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.
None of these

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