Automation System
A solenoid:

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

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Automation System
Digital signals:

None of these
have a sinusoidal shape.
can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level

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Automation System
How is the integral mode implemented on a digital controller?

the digital controller cannot handle integral mode
the error is divided into discrete amounts
None of these
All of these
the error signal is summed over a discrete time interval and accumulated by the controller

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