Automation System
In the operation of a programmable controller:

All of these
any latched data must be done using an external latching relay
all of the logic status is maintained in memory
mathematics cannot be performed
None of these

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Automation System
A sequence controller:

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

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Automation System
A solenoid:

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

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