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

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

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Automation System
Programmable controllers:

None of these
(a) and (c) above
cannot perform functions other than relay logic
are programmed using relay ladder logic
are widely used in many different industries

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