Automation System
Semiconductor devices:

All of these
None of these
have a very short infant mortality period
are less reliable than electro¬mechanical components
usually have a very short MTBF (mean time between failure)

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Automation System
Light sensors:

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

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