Automation System
Light sensors:

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

ANSWER DOWNLOAD EXAMIANS APP

Automation System
Semiconductor devices:

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

ANSWER DOWNLOAD EXAMIANS APP