Automation System
The program execution time:

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

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Automation System
Digital signals:

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
None of these

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