Automation System
Digital signals:

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

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
All of these
use an aneroid chamber with a variable resistance output
use the piezoresistive effect in strain gauge sensors
None of these

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