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

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

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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 human aspect of the environment around the workstation as well as the workstation itself
the cost relationship of the workstation versus productivity

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Automation System
A venturi tube:

is extremely difficult to use
can be used to measure gas or liquid flow rates
measures the presence of a liquid
None of these
is made only of metal

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