Automation System
Pressure sensors:

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

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Automation System
Most industrial control applications:

can be solved using more than one method of control
can be done more reliably using solid-state methods
None of these
All of these
must have the process specified correctly to be successful

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Automation System
Digital signals:

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

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