Automation System
Programmable controllers:

cannot perform functions other than relay logic
(a) and (c) above
are programmed using relay ladder logic
are widely used in many different industries
None of these

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Automation System
Numerical control:

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

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