Automation System
A solenoid:

is spring operated
is widely used in industrial automation
can be used only in de circuits
None of these
is related to an aneroid

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Automation System
A semi-continuous operation means:

coffee breaks are allowed for the operator
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
the operation is continuous each shift, but stops between shifts

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