Automation System
A Hall effect switch is usually used to:

measure temperature
sense a vacuum
sense the presence of a magnetic object.
None of these
measure voltage

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Automation System
Resolution in a CRT refers to:

the number of phosphor dots that react when hit by the electron beam
the number of pixels in each square centimeter
the number of addressable elements on the tube
the speed at which the monitor can accept data from the computer
None of these

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Automation System
What is offset error?

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

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