Automation System
A solenoid:

is spring operated
can be used only in de circuits
is related to an aneroid
None of these
is widely used in industrial automation

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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.
None of these
Creates images on the screen by scanning straight-line vectors between selected points.
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.

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Automation System
The SKETCHPAD system

All of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.
None of these
is used for interactive Graphics
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.

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