Automation System
Light sensors:

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

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Automation System
If the transient response of a system is overdamped:

the value of the output never stabilizes.
the value of the output exceeds the value of the input at times during the transient period.
All of these
None of these
the value of the output never exceeds the value of the input during the transient period.

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Automation System
Numerical control:

is a method for producing an exact number of parts per hour
applies only to milling machines
None of these
is a method for controlling the operation of a machine by means of a set of instructions
All of these

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