Automation System
An operational amplifier:

can be used to subtract two or more signals
uses the principle of feedback
All of these
can be used to sum two or more signals
None of these

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Automation System
What is proportional control?

All of these
The controller output varies continuously over a range
None of these
It has a discrete output for each error value
The gain is independent of offset error.

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Automation System
Ergonomics refers to:

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
the level of involvement the operator has with the workstation

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