Automation System
Time proportioning control:

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

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Automation System
What is the process lag?

None 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.
All of these
The time it takes for the mass of the process to respond to an input change.

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