Automation System
An aneroid barometer

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

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Automation System
Relay ladder logic is used in a PC because:

it is impossible to write a control program for a machine in any other logic
All of these
None of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.

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