Automation System
Digital signals:

have a sinusoidal shape.
can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level
None of these

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Automation System
Ergonomics refers to:

the level of involvement the operator has with the workstation
the technology involved in the workstation itself
None of these
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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