Automation System
Light sensors:

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

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Automation System
The program execution time:

None of these
must be slower than the fastest mechanical operation that is to be controlled
cannot be changed once the program is written
will vary depending on the language used
All of these

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Automation System
Programmable controllers:

are programmed using relay ladder logic
(a) and (c) above
cannot perform functions other than relay logic
are widely used in many different industries
None of these

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