Automation System
A dc servo motor:

All of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
can provide precise position control
None of these

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Automation System
A process controller:

None of these
All of these
can solve a PID process control equation easily
can interface to digital and analog I/O
is useful in a continuous process control application

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Automation System
What is offset error?

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

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