Automation System
A dc servo motor:

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

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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.
The beam constantly travels across the screen to turn on/off a series of pixels.
None of these
Creates images on the screen by scanning straight-line vectors between selected points.

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