Automation System
D/A (digital to analog) conversion:

both (b) and (c)
None of these
results in a binary code as the final output
must be fed through a filter to reproduce the original signal accurately
has to be sampled at 1/2 the highest input frequency

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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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