Automation System
A stepping motor;

None of these
is a good choice where continuous rotation is needed
has a commutator
can index positional movement.
has a speed proportional to voltage input

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

Uses an electron gun to continuously flood the surface of the tube.
Makes changes on the image by increasing the anode voltage.
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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