Automation System
An encoder:

converts a binary number to a decimal number.
can have only four keys
is used to send telegraph signals
converts an input to a binary number
None of these

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

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

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