Automation System
A semi-continuous operation means:

coffee breaks are allowed for the operator
the operation is continuous each shift, but stops between shifts
a computer is a required part of the machine
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these

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Automation System
Digital signals:

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

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