Automation System
Four basic elements are required for an automated machine tool or production process. They are: input interface, memory, output interface and:

computer graphics workstation
NC tape programming
None of these
logic
software

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

None of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.
All of these
it is impossible to write a control program for a machine in any other logic

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Automation System
Numerical control:

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

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