Automation System
Numerical control:

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

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

All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
None of these
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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