Automation System
Numerical control:

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

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Automation System
Speech recognition:

will be used in more applications as the technology matures.
is already widely used in industrial controls
All of these
will never be used in industrial controls
None of these

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Automation System
Digital signals:

None of these
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
can have three possible levels

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