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

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Automation System
Time proportioning control:

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

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Automation System
What is offset error?

the difference between the controller output and the setting of the manipulated variable.
the difference between the sensor input and the absolute sensed parameter.
None of these
the difference between the control setpoint value and the actual value.
All of these

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