Automation System
The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:

concerned with management programs
concerned with production and control of tool design
designed for communications
None of these
specifically for PC-board design

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Automation System
The program execution time:

None of these
will vary depending on the language used
must be slower than the fastest mechanical operation that is to be controlled
All of these
cannot be changed once the program is written

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Automation System
Digital signals:

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

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