Automation System
An aneroid barometer

can measure only atmospheric pressure
can be used to measure gas or liquid flow rates
None of these
measures pressure by sensing deflection of an evacuated chambers.
is very unreliable

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Automation System
Sensors:

will be much smarter and more sophisticated in the future
None of these
are not important in automation
probably will not improve over the next decade
are easily developed

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Automation System
A stepping motor;

can index positional movement.
has a commutator
None of these
has a speed proportional to voltage input
is a good choice where continuous rotation is needed

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