Automation System
Three different aspects of colour are used to define specific colours. They are hue, saturation, and:

gray scale
None of these
shading
value
metamer

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Automation System
Light sensors:

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

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Automation System
Sensors:

will be much smarter and more sophisticated in the future
probably will not improve over the next decade
are easily developed
None of these
are not important in automation

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