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
All 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
None of these

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Automation System
Numerical control:

is a method for producing an exact number of parts per hour
All of these
applies only to milling machines
is a method for controlling the operation of a machine by means of a set of instructions
None of these

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