Automation System
An operational amplifier:

All of these
can be used to subtract two or more signals
can be used to sum two or more signals
uses the principle of feedback
None of these

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Automation System
Speech recognition:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

the system must make provision for new techniques.
there should be a common 3-D part description system.
the user must have access to both hardware and software
technical assistance must be provided to the user.
None of these

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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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