Automation System
A semi-continuous operation means:

None of these
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
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

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Automation System
Programmable controllers:

(a) and (c) above
are widely used in many different industries
cannot perform functions other than relay logic
None of these
are programmed using relay ladder logic

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