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

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

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Automation System
A stepping motor;

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

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Automation System
Trend analysis:

requires a very expensive system to implement
None of these
can improve control system response
is a brand new concept
is used only in financial planning

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