Automation System
Digital signals:

have a sinusoidal shape.
None of these
can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level

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

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