Automation System
Most continuous control actuators:

are used with standard continuous control loop
are of the time proportioning type
None of these
(b) and (c) above
use a 4 to 20 mA current loop input

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Automation System
What is offset error?

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

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Automation System
What is the process lag?

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

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