Automation System
Flood guns bombard the phosphor surface of the tube in which one of the following types of CRT technology?

None of these
Stroke CRT
Raster scan CRT
Direct view storage tube
Refresh-vector CRT

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Automation System
Light sensors:

cannot be used a s limit switches.
work in direct sunlight
never use infrared light as light source
None of these
come in a wide variety of mounting styles

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