Automation System
Pressure sensors:

None of these
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

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Automation System
Speech recognition:

None of these
All of these
will be used in more applications as the technology matures.
will never be used in industrial controls
is already widely used in industrial controls

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Automation System
A dc servo motor:

uses a variable dc voltage for speed control
uses a tachometer for speed feedback
All of these
None of these
can provide precise position control

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