Automation System
Actuators are used to:

sense an object
All of these
make a mechanical movement
None of these
activate a chemical

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

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.
All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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