Automation System
Digital signals:

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

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Automation System
A venturi tube:

measures the presence of a liquid
is made only of metal
None of these
can be used to measure gas or liquid flow rates
is extremely difficult to use

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