Automation System
The refresh-vector CRT uses which of the following techniques?

Makes changes on the image by increasing the anode voltage.
Uses an electron gun to continuously flood the surface of the tube.
Creates images on the screen by scanning straight-line vectors between selected points.
The beam constantly travels across the screen to turn on/off a series of pixels.
None of these

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Automation System
What is offset error?

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

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