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.
a computer is a required part of the machine
coffee breaks are allowed for the operator

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Automation System
A dc servo motor:

can provide precise position control
None of these
uses a variable dc voltage for speed control
All of these
uses a tachometer for speed feedback

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