Automation System
A dc servo motor:

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

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Automation System
Ergonomics refers to:

None of these
the level of involvement the operator has with the workstation
the technology involved in the workstation itself
the cost relationship of the workstation versus productivity
the human aspect of the environment around the workstation as well as the workstation itself

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Automation System
Light sensors:

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

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