Automation System
Which of the following may be classified as an automation system?

automated warehouses
All of these
robotics
numerically controlled machine tools
None of these

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

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

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