Automation System
Light sensors:

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

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Automation System
Numerical control:

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

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Automation System
A dc servo motor:

None of these
can provide precise position control
All of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control

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