Automation System
Pressure sensors:

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

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Automation System
A venturi tube:

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

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Automation System
A process controller:

None of these
can solve a PID process control equation easily
is useful in a continuous process control application
can interface to digital and analog I/O
All of these

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