Automation System
Ergonomics refers to:

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
the technology involved in the workstation itself
None of these
the cost relationship of the workstation versus productivity

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Automation System
What is proportional control?

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

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Automation System
Relay ladder logic is used in a PC because:

All of these
it is impossible to write a control program for a machine in any other logic
None of these
it is the best industrial control language ever developed.
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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