Automation System
In raster-scan colour monitors, colour can be intensified by:

having each electron gun controlled by separate signal
grouping the phosphor dots in a circular pattern
having each electron gun controlled by a composite signal
using an in-line gun arrangement with a solid metal mesh
None of these

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Automation System
Light sensors:

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

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