Automation System
An operational amplifier:

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

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Automation System
A venturi tube:

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

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Automation System
Ergonomics refers to:

the cost relationship of the workstation versus productivity
None of these
the technology involved in the workstation itself
the level of involvement the operator has with the workstation
the human aspect of the environment around the workstation as well as the workstation itself

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