Automation System
Automation normally means:

None of these
a net loss of jobs.
a net increase in jobs.
All of these
no change in jobs.

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Automation System
Digital signals:

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

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Automation System
The program execution time:

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

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