Automation System
A semi-continuous operation means:

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

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Automation System
A sequence controller:

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

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