Automation System
What Is a process variable?

A controlled variable
None of these
All of these
A process parameter that changes value
A manipulated variable

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Automation System
Light sensors:

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

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Automation System
Ergonomics refers to:

the level of involvement the operator has with the workstation
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
the technology involved in the workstation itself

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Automation System
Digital signals:

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

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