Automation System
For a type 2 system, the steady-state:

None of these
error for a step input is always zero
error for a velocity input is always zero
All of these
input for acceleration input is always non-zero

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Automation System
An aneroid barometer

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

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