Automation System
A semi-continuous operation means:

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

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Automation System
A flip-flop:

None of these
is a sequential logic device
(a) and (c)
remembers what was previously stored in it
is a combinational logic device

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Automation System
An operating system:

All of these
is useless in most control applications
can help reduce software development time
provides ability for other programmers to understand the software structure
None of these

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