Automation System
A drum timer is a good example of:

a sequence controller
an output actuator
a position sensor
an input sensor
None of these

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Automation System
Light sensors:

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

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Automation System
CAE and CAM are linked through:

None of these
assembly automation and tool production.
parts production and testing
NC tape programming and automated design
a common data base and communications system

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