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

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

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Automation System
Digital signals:

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

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Automation System
An aneroid barometer

is very unreliable
None of these
can measure only atmospheric pressure
can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.

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