Automation System
An aneroid barometer

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

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Automation System
Time proportioning control:

None of these
a and b above.
can be used on a PM550 programmable process controller
is less efficient than normal PID control
cannot use a TM990 micro¬computer

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