Automation System
Digital signals:

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
have a sinusoidal shape.

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Automation System
A sequence controller:

None of these
performs on/off control functions in relation to time.
is a mechanical only controller
is difficult to program
is no longer in widespread use

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Automation System
The program execution time:

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

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