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

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Automation System
A dc servo motor:

All of these
uses a tachometer for speed feedback
can provide precise position control
None of these
uses a variable dc voltage for speed control

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