Automation System
Numerical control:

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

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Automation System
Digital signals:

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

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Automation System
An operating system:

provides ability for other programmers to understand the software structure
is useless in most control applications
None of these
All of these
can help reduce software development time

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