Automation System
A solenoid:

None of these
is related to an aneroid
is widely used in industrial automation
is spring operated
can be used only in de circuits

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Automation System
Pressure sensors:

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

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Automation System
A venturi tube:

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

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